CN-122016773-A - Rapid detection method of core flame retardant of expansion type steel structure fireproof coating based on rapid color matching technology, detection kit and application thereof

Abstract

The invention belongs to the field of rapid detection of flame retardants, and particularly relates to a rapid detection method of an intumescent steel structure fireproof coating core flame retardant based on a rapid color matching technology, a detection kit and application thereof. The invention adopts xylenol orange-zirconium system for the first time to rapidly detect the core flame retardant ammonium polyphosphate in the steel structure fireproof paint. The method provided by the invention can realize that sampling, detection and interpretation can be finished in site within 30 minutes. The supervision nodes can be moved forward to key links such as paint approach, construction and the like, the postmortem responsibility is changed into the pre-prevention, and the supervision initiative and deterrence are greatly improved. The method has the advantages of low cost and simple operation, can greatly reduce the supervision cost of wide screening and improves the sampling coverage rate. Is beneficial to purifying the market, protecting the normal enterprises and promoting the healthy and orderly development of the fireproof industry of the steel structure.

Inventors

• ZHANG CHENGRUI
• SUN YANG
• LIU CHIYU
• SONG JINXIU
• Lu Dujiang
• JU BINBIN
• JIANG HAIKUN
• WAN XIUQIN
• NIE LAICONG
• ZHANG NAN
• YANG GUANGHUI

Assignees

• 山东省产品质量检验研究院

Dates

Publication Date

20260512

Application Date

20260130

Claims (10)

1. 1. An application of xylenol orange-zirconium system in rapid detection of intumescent steel structure fire-retardant coating ammonium polyphosphate (APP).
2. 2. A rapid detection method of an intumescent steel structure fireproof paint core flame retardant based on a rapid color matching technology is characterized by comprising the following steps: When the sample to be tested is an uncoated paint: (1) Adding a solvent into a sample to be detected for dilution, and uniformly stirring until the sample is emulsion or suspension to obtain a sample diluent; (2) Dripping a uniformly mixed sample diluent into the detection solution, uniformly shaking, standing, and comparing and analyzing an experimental result with a control group and a blank group to judge whether the sample contains APP; When the sample to be detected is a dried coating coated on the surface of a steel structure, an emulsion or suspension can be formed according to the step (1), and the step (2) is as follows: (2) And (3) dripping a detection solution at the scratch with powder, standing, and comparing and analyzing the experimental result with a control group and a blank group to judge whether the sample contains APP.
3. 3. The rapid detection method according to claim 2, wherein in the step (1), the mass percentage of the sample to be detected and the solvent is 30% or less, and the solvent is deionized water or N, N-dimethylformamide.
4. 4. The rapid detection method according to claim 2, wherein in the step (2), the detection solution is a mixture of xylenol orange aqueous solution and zirconium oxychloride octahydrate aqueous solution, the concentration ratio and the volume ratio are 1:1, the concentration of xylenol orange aqueous solution is 0.005-0.01mol/L, and the concentration of zirconium oxychloride octahydrate aqueous solution is 0.005-0.01mol/L.
5. 5. The rapid inspection method according to claim 2 or 4, wherein in the step (2), when the sample to be inspected is an uncoated paint, the volume ratio of the inspection solution to the sample diluent is 1.5mL to 0.25-0.5mL, and when the sample to be inspected is a dried paint coated on the surface of the steel structure, 0.15-0.25mL of the inspection solution is dripped into the position where the scratch depth of the paint coated on the surface of the steel structure is 2-3 mm.
6. 6. The rapid detection method according to claim 2, 4 or 5, wherein the time of standing is 10 to 15 minutes.
7. 7. The rapid inspection method according to any one of claims 2 to 6, wherein in the step (2), when the sample to be inspected is an uncoated paint, the control group is a control with the same volume as the sample dilution and 1wt% APP content, the blank group is a deionized water with the same volume as the sample dilution, and when the sample to be inspected is a dried paint coated on the surface of the steel structure, the control group is a control with the 1wt% APP content and the blank group is an original inspection solution.
8. 8. A test kit prepared based on the rapid test method of any one of claims 2-7.
9. 9. Use of the detection kit according to claim 8 for rapid detection of intumescent steel structure fire retardant coating core fire retardant.
10. 10. The use according to claim 9, wherein when the sample to be detected is diluted by adding a solvent when the detection is performed using the detection kit, if the sample is completely insoluble, the sample is judged to be unsuitable for colorimetric detection, and the detection is ended.

Description

Rapid detection method of core flame retardant of expansion type steel structure fireproof coating based on rapid color matching technology, detection kit and application thereof Technical Field The invention belongs to the field of rapid detection of flame retardants, and particularly relates to a rapid detection method of an intumescent steel structure fireproof coating core flame retardant based on a rapid color matching technology, a detection kit and application thereof. Background The expansion type steel structure fireproof coating is an effective passive fireproof measure, and under the action of high temperature or flame, the coating foams and charres to form a compact expansion carbon layer which is tens times larger than the thickness of the original coating, and the temperature rise of steel components can be effectively delayed, so that a vital time window is provided for guaranteeing the structural integrity of the building and the safety evacuation and rescue of personnel. The protective efficiency of the expansion type steel structure fireproof coating depends on an expansion system formed by a foaming agent, a char forming agent and a dehydration catalyst, and the expansion multiple, the thermal stability and the heat insulation performance of the carbon layer are directly determined by the system, so that the expansion type steel structure fireproof coating is a key quality factor affecting the final performance of the coating. The current detection and evaluation of the quality of the expansion type steel structure fireproof coating mainly comprises 1) a fireproof performance test, 2) physical performance detection such as drying density, bonding strength, compressive strength and the like, and 3) chemical performance detection such as pH value, water resistance, acid resistance and the like according to detection items specified by GB 1407-2018 steel structure fireproof coating and other standards, wherein the fireproof performance is a key index to be detected. The method has the practical requirements of long period, high cost and incapability of meeting large-scale quick spot check. Ammonium polyphosphate is the most critical component for determining fire resistance, is used as a dehydration catalyst for catalyzing and forming carbon at high temperature, directly determines whether the paint can effectively expand and foam, and forms a heat insulation protective layer. Therefore, the high-efficiency and rapid detection technology aiming at the core flame retardant of the expansion system is developed, the on-site screening and quality initial judgment of key functional components of the coating are realized, the efficiency and coverage of the quality supervision of fire-fighting products are improved, and a powerful technical tool is provided for striking counterfeit products and guaranteeing public fire-fighting safety. Disclosure of Invention Aiming at the problems of long detection period, high cost, incapability of meeting large-scale quick spot check and the like in the prior art, the invention provides a quick detection method of an expansion type steel structure fireproof coating core flame retardant (APP) based on a quick color matching technology, which is used for rapidly judging whether the coating contains the APP or not through liquid color change after a sample is dripped into a detection reagent, and has the advantages of low cost, simplicity and convenience in operation, capability of greatly reducing the supervision cost of wide screening and the like. The method is suitable for uncoated paint and dried coating coated on the surface of the steel structure, and has wide application range. The invention further provides a detection kit prepared based on the rapid detection method. The invention further provides application of the detection kit in rapid detection of the core flame retardant of the expansion type steel structure fireproof coating. The technical scheme adopted by the invention for achieving the purpose is as follows: The invention provides an application of xylenol orange-zirconium system in rapid detection of steel structure fireproof coating ammonium polyphosphate (APP). The invention further aims to provide a rapid detection method of the core flame retardant of the expansion type steel structure fireproof coating based on the rapid color matching technology, which comprises the following steps: When the sample to be tested is an uncoated paint: (1) Adding a solvent into a sample to be detected for dilution, and uniformly stirring until the sample is emulsion or suspension to obtain a sample diluent; (2) Dripping a uniformly mixed sample diluent into the detection solution, uniformly shaking, standing, and comparing and analyzing an experimental result with a control group and a blank group to judge whether the sample contains APP; When the sample to be detected is a dried coating coated on the surface of a steel structure, an emulsion or suspension ca