Method for detecting the efficiency of a water-sand stripper for external wall paint removal

Abstract

The application provides a method for detecting the paint removal efficiency of a water-sand remover for an exterior wall, comprising: preparing a standardized cement mortar water-sand test block and preparing a complete set of test equipment; simulating a high-temperature summer sun exposure exterior wall construction condition to obtain a high-temperature original data set; simulating a low-temperature winter no-sunlight exterior wall construction condition to obtain a low-temperature original data set; obtaining standardized basic calculation parameters; calculating a paint removal efficiency dimension, a base material protection dimension and an environmental adaptability dimension based on the standardized basic calculation parameters to obtain a comprehensive score; and determining the qualified state of the product under double conditions to obtain a final detection determination report. The application can realize high-temperature and low-temperature outdoor condition simulation, and the consistency of the detection result with the field construction is significantly improved; a quantitative scoring system is established, the paint removal efficiency, the base material protection and the environmental adaptability evaluation are more objective, accurate and explicit, the unqualified determination rules are clear, the qualified paint remover is effectively screened, and the quality of the exterior wall repair construction and the safety of the base material are ensured.

Description

Technical Field

[0001] This invention relates to a method for testing the paint removal efficiency of water-based sand remover for exterior walls. Background Technology

[0002] Current paint remover testing primarily focuses on volatility, residue, and corrosiveness, judging product performance only from a qualitative perspective of a single property. Furthermore, product performance tests are typically conducted indoors under constant temperature and humidity conditions, lacking simulation tests for specific outdoor working conditions. Products on the market also lack effective usage instructions, making it difficult to guarantee paint removal efficiency in complex construction environments. Summary of the Invention

[0003] The purpose of this invention is to provide a method for detecting the paint removal efficiency of water-based sand remover for exterior walls.

[0004] To address the above problems, this invention provides a method for detecting the paint removal efficiency of water-based sand-coated paint remover for exterior walls, comprising:

[0005] Step S1: Prepare standardized cement mortar water-coated sand test blocks and prepare a complete set of testing equipment;

[0006] In process S2, based on standardized cement mortar test blocks with water-coated sand and a complete set of testing equipment, the construction conditions of exterior walls exposed to high temperatures in summer were simulated to obtain the original high-temperature dataset.

[0007] In process S3, based on standardized cement mortar test blocks with water-coated sand and a complete set of testing equipment, the construction conditions of exterior walls in winter with low temperature and no sunlight were simulated to obtain the original low temperature dataset.

[0008] Step S4: Based on the original high-temperature dataset and the original low-temperature dataset, standardized basic calculation parameters are obtained;

[0009] In process S5, the paint stripping efficiency score is calculated based on standardized basic calculation parameters. D1 Substrate protection dimension Score D2 and environmental adaptability dimension Score D3 ;

[0010] Process S6, based on paint stripping efficiency score D1 Substrate protection dimension Score D2 and environmental adaptability dimension Score D3 A comprehensive score is obtained;

[0011] In process S7, based on standardized basic calculation parameters and comprehensive scores, a dual-condition judgment is adopted to determine the product's qualification status in order to obtain the final inspection judgment report.

[0012] Furthermore, in the above method, step S1 involves preparing standardized cement mortar water-coated sand test blocks and preparing a complete set of testing equipment, including:

[0013] S101, select M15 strength grade cement mortar raw materials; prepare a complete set of testing equipment, including: molds for screening flatness error ≤2mm, corrosion-resistant plastic tray raw materials, nylon brush head electric cleaning brush, high pressure water gun, pH test paper, electronic weighing equipment and area measurement imaging equipment for backup;

[0014] S102, several 50cm×50cm cement mortar test blocks were cast using molds. After casting, the blocks were left to cure until the surface flatness error was controlled to be ≤2mm.

[0015] S103, uniformly coat the surface of the cured cement mortar test block with a water-based sand coating, and control the coating thickness to 1cm ± 0.1cm.

[0016] Furthermore, in the above method, step S2, based on standardized cement mortar test blocks with water-coated sand and a complete set of testing equipment, simulates the high-temperature exposure conditions of exterior wall construction in summer, obtaining a high-temperature raw dataset, including:

[0017] S201. Select an outdoor site with a minimum temperature of ≥28℃ and direct sunlight, and build a vertical placement frame with an angle of 90° to the horizontal ground. Take 6 standardized cement mortar test blocks with water-coated sand coating output from process one, fix them all on the vertical placement frame, and let them stand in the sun for 3 to 4 hours. Monitor the surface temperature of the test blocks in real time to keep it stable at 60℃±5℃ in order to obtain high temperature adaptability test blocks.

[0018] S202: Select 5 out of 6 high-temperature compatibility test blocks as test samples, and use the remaining block as a blank control sample; pour an equal amount of paint remover at a uniform rate of 5g / s ± 1g / s at the center of the upper edge of each of the 5 test sample blocks, with the total amount of agent applied to a single test block controlled within ± 2g, ensuring that the agent completely wets the vertical coating surface of the test block; place a corrosion-resistant plastic tray 10cm below the bottom edge of each test block to collect the waste liquid from the agent; after pouring, a high-temperature test block with the agent-wetted agent and the matching waste liquid tray at the bottom is obtained;

[0019] S203, the high-temperature test block is left to stand in place for 10 minutes, and the evaporation and dripping state of the agent on the surface of the test block are continuously observed; if the agent is completely dry on the surface of any high-temperature test block, a high-temperature test block with residual coating and a tray for receiving the dripping waste liquid of the agent are obtained, and the process of washing is immediately initiated; if there is no drying phenomenon, the observation is repeated every 2 minutes until the agent is completely dry.

[0020] S204, Initial brushing and high-pressure rinsing: Remove the tray and use a 200W±10W nylon electric cleaning brush with bristle length of 5mm±1mm to continuously brush the surface of the high-temperature test block carrying residual coating for 20 seconds at a uniform angle; after brushing, use a 0.3MPa high-pressure water gun to rinse at a fixed distance of 60cm. Rinse once with the water flow at a 45° angle to the test block surface; after rinsing, allow the test block to air dry in place to obtain the dried test block after the initial brushing and rinsing;

[0021] S205, Initial paint stripping effect data collection: The mass m of the waste liquid from the self-flowing agent in the tray was weighed using an electronic weighing device. drip，高温 Record the total mass of the medicine poured, m. total，高温 Calculate the sludge rate P drip，高温 Using an area imaging measurement device, the actual exposed area S of the dried test block after one treatment of the exposed cement mortar substrate was calculated. 1raw Simultaneously measure the exposed area S0 of the blank control sample exposed to the cement mortar substrate, and calculate the percentage of area stripped in one step S. 1，高温 ;

[0022] S206, Secondary Re-coating Enhancement Treatment: Observe the dried test block surface. If residual water-based sand coating remains, apply paint remover with a soft brush, ensuring complete wetting of the residual coating. Allow to stand for at least 15 minutes under the same high-temperature conditions. Repeat the brushing and rinsing operation of S204. After rinsing and drying, output the secondary treated test block; calculate the percentage of area removed by secondary paint removal. 2，高温 ;

[0023] S207, Substrate pH Testing: Wipe the surface of the primary or secondary treated test block at multiple points with pH test paper, record the pH value at each test point, and calculate the average pH deviation ΔpHavg. ，高温 ;

[0024] S208, High-Temperature Reagent Stability Test: A sample of the paint remover was placed in an outdoor environment at the same high temperature and allowed to stand continuously for 48 hours. The duration (t) during which the reagent remained uniform, without stratification, clumping, or foreign matter was continuously recorded. stable，高温 If stratification, clumping, or irreversible deterioration occurs within 12 hours, immediately stop timing and record the deterioration time.

[0025] Furthermore, in the above method, the formula for calculating the sag rate is:

[0026] P drip，高温 =m drip，高温 / m total，高温 ×100%

[0027] Percentage of paint stripping area in one go (S) 1高温 The calculation formula is:

[0028] S 1，高温 ;

[0029] S 总涂层面积 This represents the total area of ​​one side of the test block;

[0030] Calculate the percentage of area affected by secondary paint stripping (S) 2，高温 ,include ：

[0031] The actual area S of the newly exposed cement mortar substrate of the test block after secondary washing and rinsing was measured using an area imaging measurement device. 2raw ; retrieve the total coating area S of the test block measured in the previous steps. 总 One-time treatment of the actual measured area S of exposed bare skin 1raw Compared with the blank control baseline exposed area S0, the residual coating area after the initial treatment is first calculated. Then follow the formula

[0032] S 2，高温 The calculated percentage of the area affected by secondary paint stripping, S, was obtained. 2，高温 The acceptable threshold is S. 2，高温 ≥90%.

[0033] Furthermore, in the above method, step S3, based on standardized cement mortar test blocks with water-coated sand and a complete set of testing equipment, simulates the construction conditions of exterior walls in winter with low temperature and no sunlight, and obtains the original low-temperature dataset, including:

[0034] S301. Select an outdoor site with a maximum daily temperature of ≤7℃ and no direct sunlight, and set up a vertical placement frame at a 90° angle to the horizontal ground. Take the standardized coating test block from step S1, wipe the surface of the standardized coating test block with a soft cloth to remove all water droplets, and then fix the standardized coating test block in the vertical placement frame and leave it outdoors for 3-4 hours to complete the low temperature environment adaptation pretreatment and obtain the low temperature adaptation test block.

[0035] S302, Repeated application of agent, static observation, brushing and rinsing, secondary coating, and pH testing: Refer to the standardized operating parameters of S202~S207, unify the agent flow rate, total amount applied, brushing equipment parameters, rinsing water pressure, and static time, and complete the testing of paint removal effect, sagging rate, and substrate pH under low temperature conditions.

[0036] S303, Low-temperature reagent stability test: Take the original sample of the paint remover to be tested and place it in an outdoor environment with the same low temperature for 48 hours. Record the continuous stability time t for the reagent to be uniform without layering, clumping, or foreign matter without interruption. stable低温If stratification, clumping, or irreversible deterioration occurs within 12 hours, immediately stop timing and record the deterioration time.

[0037] S304 outputs the raw low-temperature dataset, including: P drip，低温 S 1，低温 S 2，低温 ΔpHavg ，低温 and t stable，低温 There are five categories of quantified raw data.

[0038] Furthermore, in the above method, step S4, based on the original high-temperature dataset and the original low-temperature dataset, obtains standardized basic calculation parameters;

[0039] Based on the original high-temperature and low-temperature datasets, standardized basic computational parameters are obtained, including:

[0040] The average area of ​​paint stripping in one go is S1, of which, ;

[0041] The average area of ​​secondary paint stripping is S2, of which, ;

[0042] Average sludge rate P drip ,in, ;

[0043] Average pH deviation ΔpH avg ,in, ;

[0044] t stable，高温 ;

[0045] t stable，低温 .

[0046] Furthermore, in the above method, in step S5, the paint stripping efficiency dimension Score is calculated based on standardized basic calculation parameters. D1 Substrate protection dimension Score D2 and environmental adaptability dimension Score D3 ,include:

[0047] S501, Paint Removal Efficiency Score D1 Calculation:

[0048] 1) First-time paint peeling rate score D1-1 =min (100, S1 / 95%×100), with an upper limit of 100 points, where S1 is the average percentage of paint peeling area after aggregation;

[0049] 2) Secondary paint peeling rate score D1-2=min (100, S2 / 97%×100), with an upper limit of 100 points, where S2 is the average percentage of secondary paint peeling area after aggregation;

[0050] 3) Overall score for paint removal efficiency D1 =0.7×Score D1-1 +0.3×ScoreD1-2;

[0051] S502, Substrate Protection Dimension Score D2 Calculation:

[0052] 1) Sludge rate score D2-1 =max (0, (20%−P_drip) / 20%×100), where the score is 0 when Pdrip>20%;

[0053] 2) pH Neutrality Score D2-2 =max (0, 100−50×ΔpH avg );

[0054] 3) Substrate Protection Overall Score D2 =0.4×Score D2-1 +0.6×Score D2-2 ;

[0055] S503, Score for Environmental Adaptability Dimension D3 calculate:

[0056] 1) High-temperature stability score D3-1 =100× t stable，高温 / 48; If it deteriorates within 12 hours, it is directly deemed invalid;

[0057] 2) Low-temperature stability score D3-2 =100× t stable，低温 / 48; If it deteriorates within 12 hours, it is directly deemed invalid;

[0058] 3) Environmental adaptability score D3 =0.5×Score D3-1 +0.5×Score D3-2 .

[0059] Furthermore, in the above method, step S6 is based on the paint stripping efficiency dimension (Score). D1 Substrate protection dimension Score D2 and environmental adaptability dimension Score D3 The overall score is obtained, including:

[0060] Based on the three component-level scores of process S6, a comprehensive score is calculated using fixed weighting coefficients:

[0061] Overall score = 0.50 × Score D1 +0.30×Score D2 +0.20×Score D3 .

[0062] Furthermore, in the above method, process S7, based on standardized basic calculation parameters and comprehensive scores, employs a dual-condition approach to determine the product's qualification status, thereby obtaining a final inspection and judgment report, including:

[0063] Based on the standardized basic calculation parameters of process S4 and the comprehensive score of process S6, a dual-condition judgment is made on the product's qualification status. Four types of fatal defects are set as veto conditions. If any condition is triggered, regardless of the comprehensive score value, the remover is directly judged as unqualified.

[0064] V1: Average sludge rate P after aggregation drip >20%;

[0065] V2: The average percentage of secondary paint stripping area after aggregation is S2 < 90%;

[0066] V3: pH < 4 or pH > 10 at any test point under any high or low temperature conditions;

[0067] V4: Under any high or low temperature conditions, the paint remover will show layering, clumping, and irreversible deterioration within 12 hours;

[0068] If none of the four veto conditions are triggered, the performance evaluation of the remover is completed based on the comprehensive score, and the final test judgment report is output.

[0069] The present invention has the following advantages:

[0070] 1. Enables simulation of high and low temperature outdoor working conditions, significantly improving the consistency between test results and on-site construction;

[0071] 2. Establish a quantitative scoring system to make the evaluation of paint stripping efficiency, substrate protection, and environmental adaptability more objective and accurate;

[0072] 3. Clarify the rules for determining non-compliance, effectively screen qualified paint removers, and ensure the quality of exterior wall repair construction and the safety of the substrate. Attached Figure Description

[0073] Figure 1 This is a flowchart of a method for detecting the paint removal efficiency of a water-based sand-removing agent for exterior walls, according to an embodiment of the present invention. Detailed Implementation

[0074] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0075] This invention relates to a method for testing the paint removal effect of water-based sand-coated paint remover on exterior walls. The method comprises seven closed-loop processes: standardized preparation of pre-test blocks (S1), high-temperature outdoor simulation testing (S2), low-temperature outdoor simulation testing (S3), raw test data collection (S4), quantitative sub-item score calculation (S5), comprehensive performance score calculation (S6), and product qualification determination (S7). All preceding output materials and data serve as the sole input for subsequent processes, eliminating any undefined parameters or abrupt additions of equipment or materials. Figure 1 As shown, the complete operation flow for each process is as follows:

[0076] Standardized preparation process S1 for pre-test blocks, and standardized preparation process for cement mortar water-based sand-coated test blocks:

[0077] This process outputs standardized coating test blocks, which serve as the sole test substrate for both high-temperature and low-temperature outdoor testing procedures. Complete operation steps:

[0078] S101, Raw material selection: Select M15 strength grade cement mortar raw material; prepare a complete set of testing equipment, including: molds for screening flatness error ≤2mm, corrosion-resistant plastic tray raw material, nylon brush head electric cleaning brush, high pressure water gun, pH test paper, electronic weighing equipment and area measurement imaging equipment for backup;

[0079] S102, Test block casting: Several cement mortar test blocks with a size of 50cm×50cm are cast using molds. After casting, they are left to cure until the surface flatness error is controlled to be ≤2mm.

[0080] S103, Water-in-sand coating: Apply a water-in-sand coating evenly to the surface of the cured cement mortar test block, controlling the coating thickness to 1cm ± 0.1cm;

[0081] Here, several 50cm x 50cm cement mortar test blocks are prepared, with a strength grade of M15 and a surface flatness error of ≤2mm. A layer of water-based sand is coated on each block, 1cm ± 0.1cm thick (a common thickness in actual engineering), and allowed to dry for 2-3 hours.

[0082] S104, Coating Drying: The coated test blocks are left to dry at room temperature for 2-3 hours. After drying, standardized cement mortar test blocks with water-coated sand are obtained and supplied to the high-temperature outdoor simulation testing process and the low-temperature outdoor simulation testing process, respectively.

[0083] The materials obtained in this process S1 are: standardized coating test blocks and a complete set of standardized testing equipment; the basic output parameters are: test block size 50cm×50cm, mortar strength M15, coating thickness 1cm±0.1cm, and drying time 2~3h. All parameters are transferred to the subsequent two outdoor testing processes as fixed input conditions.

[0084] Process S2, Summer High Temperature Outdoor Simulation Testing Process:

[0085] Based on the standardized cement mortar test blocks with water-coated sand coating obtained from process S1 and a complete set of testing equipment, the complete closed-loop operation steps were simulated to simulate the high-temperature exposure of exterior walls in summer.

[0086] S201, Pre-treatment for high temperature environment: Select an outdoor site with a minimum temperature of ≥28℃ and direct sunlight, and build a vertical placement frame with an angle of 90° to the horizontal ground; take 6 standardized cement mortar test blocks with water-coated sand coating output from process one, fix them all on the vertical placement frame, let them stand in the sun for 3-4 hours, and monitor the surface temperature of the test blocks in real time to keep it stable at 60℃±5℃, so as to obtain high temperature adaptability test blocks;

[0087] Here, six test blocks were placed outdoors in the summer with sunlight, where the minimum temperature of the day was above 28°C, and the sunlight lasted for 3 to 4 hours. The surface temperature was tested to be around 60°C ± 5°C. The blocks were placed on a rack at a 90° angle to the horizontal ground.

[0088] S202, quantitative application of paint remover: Select 5 out of 6 high-temperature compatibility test blocks as test samples, and use the remaining block as a blank control sample; at the center of the upper edge of the 5 test sample blocks, pour an equal amount of paint remover at a uniform rate of 5g / s ± 1g / s, with the total amount of agent applied to a single test block controlled within ± 2g, ensuring that the agent completely wets the vertical coating surface of the test block; place a corrosion-resistant plastic tray 10cm below the bottom edge of each test block to collect the waste liquid from the agent; after pouring, a high-temperature test block with the agent-wetted agent and the matching waste liquid tray at the bottom is obtained;

[0089] Here, five test blocks were in situ from the center of the top edge, and the same amount (±2g) of paint remover was poured at a constant speed (pouring speed 5g / s±1g / s) onto them.

[0090] Fully saturate the entire surface, place the coating vertically, and place a tray on the bottom edge of the substrate. The tray should be placed 10cm below the bottom edge of the substrate and made of corrosion-resistant plastic.

[0091] S203, Static observation of the reagent: The high-temperature test block is placed in place for 10 minutes, and the evaporation and dripping state of the reagent on the surface of the test block are continuously observed; if the surface of any high-temperature test block shows that the reagent is completely dry, a high-temperature test block with residual coating and a tray for receiving the waste liquid of the reagent are obtained, and the cleaning process is started immediately; if there is no drying phenomenon, the observation is repeated every 2 minutes until the reagent is completely dry.

[0092] Here, after 10 minutes, observe the evaporation and dripping of the surface reagent. If any test block surface becomes dry, remove the tray and wash the test block. If it does not dry, observe it every 2 minutes.

[0093] S204, Initial brushing and high-pressure rinsing: Remove the tray and use a 200W±10W nylon electric cleaning brush with bristle length of 5mm±1mm to continuously brush the surface of the high-temperature test block carrying residual coating for 20 seconds at a uniform angle; after brushing, use a 0.3MPa high-pressure water gun to rinse at a fixed distance of 60cm; rinse once with the water flow at a 45° angle to the surface of the test block; after rinsing, let the test block air dry in place to obtain the dried test block after the initial brushing and rinsing;

[0094] Here, the above-mentioned brushing was carried out using an electric cleaning brush with a power of 200W±10W, a brush head made of nylon, and a bristle length of 5mm±1mm. The brushing was carried out at the same angle and with the same power for 20 seconds. After brushing the surface once, a high-pressure water gun was used for rinsing at a pressure of 0.3MPa, a rinsing distance of 60cm, and a water flow angle of 45° to the surface of the test block. After rinsing once, the test block was placed in its original position to air dry.

[0095] S205, Initial paint stripping effect data collection: The mass m of the waste liquid from the self-flowing agent in the tray was weighed using an electronic weighing device. drip，高温 Record the total mass of the medicine poured, m. total，高温 Calculate the sludge rate P drip，高温 =m drip，高温 / m total，高温 ×100%; Using an area imaging measurement device, the actual exposed area S of the dried test block exposed to the cement mortar substrate after one treatment was calculated. 1raw Simultaneously measure the exposed area S0 of the blank control sample exposed to the cement mortar substrate, and calculate the percentage of area stripped in one step S. 1高温 ;

[0096] S 1，高温 ;

[0097] S 总涂层面积 This refers to the total area of ​​one side of the test block, such as 50 × 50 = 2500 cm². 2 .

[0098] The proportion of liquid dripping from the weighing tray to the total poured mass should not exceed 20%. Specifically, the mass m of the self-flowing liquid collected in the tray should be weighed using electronic weighing equipment. drip，高温 The total mass m of paint remover poured from a single test block is recorded in the previous reagent pouring process. total，高温 According to formula P drip，高温 =m drip / m total The sag rate is calculated as ×100%; the sag rate under qualified working conditions shall not exceed 20%; if the calculated sag rate exceeds 20%, the sample shall be directly recorded as an out-of-standard sample and enter the subsequent veto judgment process.

[0099] After the test blocks are dried, the area exposed on the cement mortar surface is calculated. The surface of the test blocks under the same working conditions without the use of paint remover is compared, and the paint removal rate of the water-coated sand removal area and the improvement ratio without the use of paint remover are calculated.

[0100] S206, Secondary Re-coating Enhancement Treatment: Observe the dried test block surface. If residual water-based sand coating remains, apply paint remover with a soft brush, ensuring complete wetting of the residual coating. Allow to stand for at least 15 minutes under the same high-temperature conditions. Repeat the brushing and rinsing operation of S204. After rinsing and drying, output the secondary treated test block; calculate the percentage of area removed by secondary paint removal. 2，高温 ;

[0101] Specifically, the area S of the newly exposed cement mortar substrate on the test block after the second washing and rinsing was measured using an area imaging measurement device. 2raw ; retrieve the total coating area S of the test block measured in the previous steps. 总 One-time treatment of the actual measured area S of exposed bare skin 1raw Compared with the blank control baseline exposed area S0, the residual coating area after the initial treatment is first calculated. Then follow the formula

[0102] S 2，高温 The calculated percentage of the area affected by secondary paint stripping, S, was obtained. 2高温 The acceptable threshold is S. 2，高温 ≥90%, if the calculated S 2高温 If the percentage is less than 90%, the product non-conformity judgment condition V2 will be triggered after aggregation.

[0103] Here, observe the surface of the cement mortar test block; there should be no residual reagent on the surface of the test block.

[0104] If there are residual water-coated sands on the surface of the test block, apply paint remover with a soft brush to ensure that the surface is fully wetted. Let it stand for more than 15 minutes under the same conditions, then brush and rinse it again. After rinsing once, observe that more than 90% of the water-coated sands should be removed.

[0105] S207, Substrate pH Testing: Wipe the surface of the primary or secondary treated test block at multiple points with pH test paper, record the pH value at each test point, and calculate the average pH deviation ΔpHavg. ，高温 ;

[0106] Here, the surface of the test block after the above reaction was tested with pH test paper and should be neutral.

[0107] S208, High-Temperature Reagent Stability Test: A sample of the paint remover was placed in an outdoor environment at the same high temperature and allowed to stand continuously for 48 hours. The duration (t) during which the reagent remained uniform, without stratification, clumping, or foreign matter was continuously recorded. stable，高温 If stratification, clumping, or irreversible deterioration occurs within 12 hours, immediately stop timing and record the deterioration time.

[0108] Therefore, when placed in the above-mentioned high-temperature outdoor environment for 48 hours, the reagent should remain uniform and should not exhibit phenomena such as layering, clumping, or foreign matter.

[0109] S209, Output of raw data for high-temperature process: A unified output of the raw high-temperature dataset, including: P drip，高温 S 1，高温 S 2高温 ΔpHavg ，高温 , t stable，高温 All five types of raw quantitative data are transferred to the data acquisition process S4.

[0110] Process S3, Winter Low Temperature Outdoor Simulation Testing Process:

[0111] Based on standardized coating test blocks and a complete set of testing equipment for process S1, the construction conditions of exterior walls in low temperature and no sunlight during winter were simulated, and the complete closed-loop operation steps were implemented:

[0112] S301, Low-temperature environment pretreatment: Select an outdoor site with the highest temperature of the day ≤7℃ and no direct sunlight, and build a vertical placement frame with an angle of 90° to the horizontal ground; take the standardized coating test block from step S1, wipe the surface of the standardized coating test block with a soft cloth to remove all water droplets, fix the standardized coating test block in the vertical placement frame and leave it outdoors for 3-4 hours to complete the low-temperature environment adaptation pretreatment and obtain the low-temperature adaptation test block;

[0113] S302, Repeated application of agent, static observation, brushing and rinsing, secondary coating, and pH testing: Refer to the standardized operating parameters of S202~S207, unify the agent flow rate, total amount applied, brushing equipment parameters, rinsing water pressure, and static time, and complete the testing of paint removal effect, sagging rate, and substrate pH under low temperature conditions.

[0114] Here, under the low-temperature conditions of winter, with the daily high temperature below 7℃ and no sunshine, the test block is placed outdoors for 3-4 hours.

[0115] Wipe the surface with a soft cloth to ensure there are no water droplets, and conduct the test block experiment in the same manner as described above.

[0116] Prepare several 50cm x 50cm cement mortar test blocks, coat them with a 1cm thick layer of water-based sand, and allow them to dry for 2-3 hours.

[0117] Repeat the above experimental steps.

[0118] S303, Low-temperature reagent stability test: Take the original sample of the paint remover to be tested and place it in an outdoor environment with the same low temperature for 48 hours. Record the continuous stability time t for the reagent to be uniform without layering, clumping, or foreign matter without interruption. stable，低温 If stratification, clumping, or irreversible deterioration occurs within 12 hours, immediately stop timing and record the deterioration time.

[0119] Within 48 hours of being placed in the aforementioned low-temperature outdoor environment, the reagent should remain uniform and should not exhibit any layering, clumping, or foreign matter.

[0120] S304, Output of raw data for cryogenic processes: A unified output of the raw cryogenic dataset, including: P drip，低温 S 1，低温 S 2，低温 ΔpHavg ，低温 and t stable，低温 All five types of raw quantitative data are transferred to the data acquisition process S4.

[0121] Step S4, Raw Test Data Collection and Acquisition Step:

[0122] Based on the high-temperature raw dataset obtained from process S2 and the low-temperature raw dataset obtained from process S3, standardized basic calculation parameters are obtained, including:

[0123] The average area of ​​paint stripping in one go is S1, of which, ;

[0124] The average area of ​​secondary paint stripping is S2, of which, ;

[0125] Average sludge rate P drip ,in, ;

[0126] Average pH deviation ΔpH avg ,in, ;

[0127] t stable，高温 ;

[0128] t stable，低温 .

[0129] Process S5, quantification and score calculation for each sub-item:

[0130] Input materials: Process S4 outputs all standardized basic calculation parameters, using a fixed linear scoring formula to calculate the paint stripping efficiency score. D1 Substrate protection dimension Score D2 Environmental adaptability dimension Score D3 :

[0131] S501, Paint Removal Efficiency Score D1 Calculation:

[0132] 1) First-time paint peeling rate score D1-1 =min (100, S1 / 95%×100), with an upper limit of 100 points, where S1 is the average percentage of paint peeling area after aggregation;

[0133] 2) Secondary paint peeling rate score D1-2 =min (100, S2 / 97%×100), with an upper limit of 100 points, where S2 is the average percentage of secondary paint peeling area after aggregation;

[0134] 3) Overall score for paint removal efficiency D1 =0.7×Score D1-1 +0.3×ScoreD1-2;

[0135] S502, Substrate Protection Dimension Score D2 Calculation:

[0136] 1) Sludge rate score D2-1 =max (0, (20%−P_drip) / 20%×100), where the score is 0 when Pdrip>20%;

[0137] 2) pH Neutrality Score D2-2 =max (0, 100−50×ΔpH avg );

[0138] 3) Substrate Protection Overall Score D2 =0.4×Score D2-1 +0.6×Score D2-2 ;

[0139] S503, Score for Environmental Adaptability DimensionD3 calculate:

[0140] 1) High-temperature stability score D3-1 =100× t stable高温 / 48; If it deteriorates within 12 hours, it is directly deemed invalid;

[0141] 2) Low-temperature stability score D3-2 =100× t stable低温 / 48; If it deteriorates within 12 hours, it is directly deemed invalid;

[0142] 3) Environmental adaptability score D3 =0.5×Score D3-1 +0.5×Score D3-2 ;

[0143] S504 Sub-item Score Output: Outputs the sub-item scores of Score_D1, Score_D2, and Score_D3, which are then passed to the comprehensive score calculation process.

[0144] Here, the paint removal effect of water-based sand remover is comprehensively evaluated from three aspects: paint removal efficiency (paint removal rate after one test and paint removal rate after two tests), substrate protection (residual amount of paint remover and neutral surface test after the test), and environmental adaptability (the reagent is uniform and does not stratify or clump under high temperature and low temperature environments), as shown in Table 1.

[0145] Table 1

[0146] D1-1 First-time paint stripping rate <![CDATA[min(100, S1 / 95% × 100)]]> <![CDATA[Linear scoring is performed according to the full score benchmark ratio, with an upper limit of 100, and S1 is the proportion of paint removal area after one process <!-- 8 -->]]> D1-2 Secondary paint peeling rate <![CDATA[min(100, S2 / 97% × 100)]]> <![CDATA[As above, S2 is the removal ratio in the residual area after secondary treatment]]> D2-1 Sagging Rate max(0, (20%−P_drip) / 20%× 100) The lower the better; exceeding the limit results in 0 points. P_drip = m_drip / m_total × 100%: the ratio of pallet collection to dumping volume; P_ref = 20%: the compliance limit; exceeding this limit results in 0 points. D2-2 pH neutrality max(0, 100 − 50 × ΔpH_avg) <![CDATA[The smaller the deviation, the better. If the pH of any test point is < 4 or pH > 10, a one-vote veto is triggered, ΔpH_avg = (1 / n) × Σᵢ₌1ⁿ |pHᵢ − 7|]]> D3-1 High Temperature Stability 100 × t_stable / 48 The actual stable duration is divided by the target duration. If significant stratification, clumping, or irreversible deterioration occurs within 12 hours, a veto is triggered. t_stable: the continuous duration (in hours) during which the reagent remains homogeneous (without stratification, clumping, or foreign matter). When irreversible deterioration occurs, the time of occurrence is recorded and the timing is stopped. D3-2 Low Temperature Stability 100 × t_stable / 48 Same as above

[0147] Score D1 = 0.7 × Score D1-1 + 0.2 × Score D1-2 ;

[0148] Score D2 = 0.4 × Score D2-1 + 0.6 × Score D2-2 ;

[0149] Score D3 = 0.5 × Score D3-1 + 0.5 × Score D3-2 .

[0150] Process S6, the process for calculating the overall performance score:

[0151] Based on the three component-level scores of process S6, a comprehensive score is calculated using fixed weighting coefficients:

[0152] Overall score = 0.50 × Score D1 +0.30×Score D2 +0.20×Score D3 ;

[0153] The overall performance score of the desiccant is output and simultaneously transmitted to the product qualification judgment process.

[0154] For example, the overall score = 0.50 × Score D1 + 0.30 × Score D2 + 0.20 ×ScoreD3.

[0155] Process S7, Product Conformity Closed-Loop Judgment Process:

[0156] Based on the standardized basic calculation parameters of process S4 and the comprehensive score of process S6, a dual-condition judgment is made on the product's qualification status. Four types of fatal defects are set as veto conditions. If any condition is triggered, regardless of the comprehensive score value, the remover is directly judged as unqualified.

[0157] V1: Average sludge rate P after aggregation drip >20%;

[0158] V2: The average percentage of secondary paint stripping area after aggregation is S2 < 90%;

[0159] V3: pH < 4 or pH > 10 at any test point under any high or low temperature conditions;

[0160] V4: Under any high or low temperature conditions, the paint remover will show layering, clumping, and irreversible deterioration within 12 hours;

[0161] If none of the four veto conditions are triggered, the performance evaluation of the remover is completed based on the comprehensive score, and the final test judgment report is output.

[0162] As shown in Table 2 below, if any of the following situations occur, regardless of the overall score, the rating will be directly determined as "unqualified":

[0163] Table 2

[0164] V1 P_drip > 20% (overflow rate) V2 <![CDATA[S2 < 90% (the secondary paint removal rate fails to meet the standard)]]> V3 At any test point, pH < 4 or pH > 10 V4 Under high or low temperature conditions, obvious stratification, clumping, or irreversible deterioration occurs within 12 hours.

[0165] In summary, the present invention has the following advantages:

[0166] 1. Enables simulation of high and low temperature outdoor working conditions, significantly improving the consistency between test results and on-site construction;

[0167] 2. Establish a quantitative scoring system to make the evaluation of paint removal efficiency, substrate protection, and environmental adaptability more objective and accurate;

[0168] 3. Clarify the rules for determining non-compliance, effectively screen qualified paint removers, and ensure the quality of exterior wall repair construction and the safety of the substrate.

[0169] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0170] Obviously, those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Therefore, if these modifications and variations fall within the scope of the claims of the invention and their equivalents, the invention is also intended to include these modifications and variations.

Claims

1. A method for detecting the paint removal efficiency of a water-based sand-coated paint remover for exterior walls, characterized in that, include: Step S1: Prepare standardized cement mortar water-coated sand test blocks and prepare a complete set of testing equipment; In process S2, based on standardized cement mortar test blocks with water-coated sand and a complete set of testing equipment, the construction conditions of exterior walls exposed to high temperatures in summer were simulated to obtain the original high-temperature dataset. In process S3, based on standardized cement mortar test blocks with water-coated sand and a complete set of testing equipment, the construction conditions of exterior walls in winter with low temperature and no sunlight were simulated to obtain the original low temperature dataset. Step S4: Based on the original high-temperature dataset and the original low-temperature dataset, standardized basic calculation parameters are obtained; In process S5, the paint stripping efficiency score is calculated based on standardized basic calculation parameters. D1 Substrate protection dimension Score D2 and environmental adaptability dimension Score D3 ; Process S6, based on paint stripping efficiency score D1 Substrate protection dimension Score D2 and environmental adaptability dimension Score D3 A comprehensive score is obtained; In process S7, based on standardized basic calculation parameters and comprehensive scores, a dual-condition judgment is adopted to determine the product's qualification status in order to obtain the final inspection judgment report. Process S2, based on standardized cement mortar test blocks with water-coated sand and a complete set of testing equipment, simulates the high-temperature exposure conditions of exterior wall construction in summer, obtaining a raw high-temperature dataset, including: S201. Select an outdoor site with a minimum temperature of ≥28℃ and direct sunlight, and build a vertical placement frame with an angle of 90° to the horizontal ground. Take 6 standardized cement mortar test blocks with water-coated sand coating output from process one, fix them all on the vertical placement frame, and let them stand in the sun for 3 to 4 hours. Monitor the surface temperature of the test blocks in real time to keep it stable at 60℃±5℃ in order to obtain high temperature adaptability test blocks. S202: Select 5 out of 6 high-temperature compatibility test blocks as test samples, and use the remaining block as a blank control sample; pour an equal amount of paint remover at a uniform rate of 5g / s ± 1g / s at the center of the upper edge of each of the 5 test sample blocks, with the total amount of agent applied to a single test block controlled within ± 2g, ensuring that the agent completely wets the vertical coating surface of the test block; place a corrosion-resistant plastic tray 10cm below the bottom edge of each test block to collect the waste liquid from the agent; after pouring, a high-temperature test block with the agent-wetted agent and the matching waste liquid tray at the bottom is obtained; S203, the high-temperature test block is left to stand in place for 10 minutes, and the evaporation and dripping state of the agent on the surface of the test block are continuously observed; if the agent is completely dry on the surface of any high-temperature test block, a high-temperature test block with residual coating and a tray for receiving the dripping waste liquid of the agent are obtained, and the process of washing is immediately initiated; if there is no drying phenomenon, the observation is repeated every 2 minutes until the agent is completely dry. S204, Initial brushing and high-pressure rinsing: Remove the tray and use a 200W±10W nylon electric cleaning brush with bristle length of 5mm±1mm to continuously brush the surface of the high-temperature test block carrying residual coating for 20 seconds at a uniform angle; after brushing, use a 0.3MPa high-pressure water gun to rinse at a fixed distance of 60cm; rinse once with the water flow at a 45° angle to the surface of the test block; after rinsing, let the test block air dry in place to obtain the dried test block after the initial brushing and rinsing; S205, Initial paint stripping effect data collection: The mass m of the waste liquid from the self-flowing agent in the tray was weighed using an electronic weighing device. drip，高温 Record the total mass of the medicine poured, m. total，高温 Calculate the sludge rate P drip，高温 Using an area imaging measurement device, the actual exposed area S of the dried test block after one treatment of the exposed cement mortar substrate was calculated. 1raw Simultaneously measure the exposed area S0 of the blank control sample exposed to the cement mortar substrate, and calculate the percentage of area stripped in one step S. 1，高温 ; S206, Secondary Re-coating Enhancement Treatment: Observe the dried test block surface. If residual water-based sand coating is present, apply paint remover with a soft brush, ensuring complete wetting of the residual coating. Allow to stand for at least 15 minutes under the same high-temperature conditions. Repeat the brushing and rinsing operations of S204. After rinsing and drying, output the secondary treated test block; calculate the percentage of area removed by secondary paint removal. 2，高温 ; S207, Substrate pH Testing: Wipe the surface of the primary or secondary treated test block at multiple points with pH test paper, record the pH value at each test point, and calculate the average pH deviation ΔpHavg. ，高温 ; S208, High-Temperature Reagent Stability Test: A sample of the paint remover was placed in an outdoor environment at the same high temperature and allowed to stand continuously for 48 hours. The duration (t) during which the reagent remained uniform, without stratification, clumping, or foreign matter was continuously recorded. stable，高温 If stratification, clumping, or irreversible deterioration occurs within 12 hours, immediately stop timing and record the deterioration time. Process S3, based on standardized cement mortar test blocks with water-coated sand and a complete set of testing equipment, simulates the construction conditions of exterior walls in winter with low temperature and no sunlight, and obtains the original low-temperature dataset, including: S301. Select an outdoor site with a maximum daily temperature of ≤7℃ and no direct sunlight, and set up a vertical placement frame at a 90° angle to the horizontal ground. Take the standardized coating test block from step S1, wipe the surface of the standardized coating test block with a soft cloth to remove all water droplets, and then fix the standardized coating test block in the vertical placement frame and leave it outdoors for 3-4 hours to complete the low temperature environment adaptation pretreatment and obtain the low temperature adaptation test block. S302, Repeated application of agent, static observation, brushing and rinsing, secondary coating, and pH testing: Refer to the standardized operating parameters of S202~S207, unify the agent flow rate, total amount applied, brushing equipment parameters, rinsing water pressure, and static time, and complete the testing of paint removal effect, sagging rate, and substrate pH under low temperature conditions. S303, Low-temperature reagent stability test: Take the original sample of the paint remover to be tested and place it in an outdoor environment with the same low temperature for 48 hours. Record the continuous stability time t for the reagent to be uniform without layering, clumping, or foreign matter without interruption. stable，低温 If stratification, clumping, or irreversible deterioration occurs within 12 hours, immediately stop timing and record the deterioration time. S304 outputs the raw low-temperature dataset, including: P drip，低温 S 1，低温 S 2，低温 ΔpHavg ，低温 and t stable，低温 There are five categories of quantified raw data; Step S4: Based on the original high-temperature dataset and the original low-temperature dataset, standardized basic calculation parameters are obtained; Based on the original high-temperature and low-temperature datasets, standardized basic computational parameters are obtained, including: The average area of ​​paint stripping in one go is S1, of which, ; The average area of ​​secondary paint stripping is S2, of which, ; Average sludge rate P drip ,in, ; Average pH deviation ΔpH avg ,in, ; t stable，高温 ； t stable，低温 ； In process S5, the paint stripping efficiency score is calculated based on standardized basic calculation parameters. D1 Substrate protection dimension Score D2 and environmental adaptability dimension Score D3 ,include: S501, Paint Removal Efficiency Score D1 Calculation: 1) First-time paint peeling rate score D1-1 =min (100, S1 / 95%×100), with an upper limit of 100 points, where S1 is the average percentage of paint peeling area after aggregation; 2) Secondary paint peeling rate score D1-2 =min (100, S2 / 97%×100), with an upper limit of 100 points, where S2 is the average percentage of secondary paint peeling area after aggregation; 3) Overall score for paint removal efficiency D1 =0.7×Score D1-1 +0.3×ScoreD1-2; S502, Substrate Protection Dimension Score D2 Calculation: 1) Sludge rate score D2-1 =max (0, (20%−P_drip) / 20%×100), where the score is 0 when Pdrip>20%; 2) pH Neutrality Score D2-2 =max (0, 100−50×ΔpH avg ); 3) Substrate Protection Overall Score D2 =0.4×Score D2-1 +0.6×Score D2-2 ; S503, Score for Environmental Adaptability Dimension D3 calculate: 1) High-temperature stability score D3-1 =100× t stable，高温 / 48; If it deteriorates within 12 hours, it is directly deemed invalid; 2) Low-temperature stability score D3-2 =100× t stable低温 / 48; If it deteriorates within 12 hours, it is directly deemed invalid; 3) Environmental adaptability score D3 =0.5×Score D3-1 +0.5×Score D3-2 .

2. The method for detecting the paint removal efficiency of water-based sand-removing agent for exterior walls as described in claim 1, characterized in that, Step S1: Prepare standardized cement mortar water-coated sand test blocks and prepare a complete set of testing equipment, including: S101, select M15 strength grade cement mortar raw materials; prepare a complete set of testing equipment, including: molds for screening flatness error ≤2mm, corrosion-resistant plastic tray raw materials, nylon brush head electric cleaning brush, high pressure water gun, pH test paper, electronic weighing equipment and area measurement imaging equipment for backup; S102, several 50cm×50cm cement mortar test blocks were cast using molds. After casting, the blocks were left to cure until the surface flatness error was controlled to be ≤2mm. S103, uniformly coat the surface of the cured cement mortar test block with a water-based sand coating, and control the coating thickness to 1cm ± 0.1cm.

3. The method for detecting the paint removal efficiency of water-based sand-removing agent for exterior walls as described in claim 1, characterized in that, The formula for calculating the sag rate is: P drip，高温 =m drip，高温 / m total，高温 ×100% ; Percentage of paint stripping area in one go (S) 1，高温 The calculation formula is: S 1，高温 ； S 总涂层面积 This represents the total area of ​​one side of the test block.

4. The method for detecting the paint removal efficiency of water-based sand-removing agent for exterior walls as described in claim 1, characterized in that, Calculate the percentage of area affected by secondary paint stripping (S) 2，高温 ,include: The actual area S of the newly exposed cement mortar substrate of the test block after secondary washing and rinsing was measured using an area imaging measurement device. 2raw ; retrieve the total coating area S of the test block measured in the previous steps. 总 One-time treatment of the actual measured area S of exposed bare skin 1raw Compared with the blank control baseline exposed area S0, the residual coating area after the initial treatment is first calculated. Then follow the formula S 2，高温 The calculated percentage of the area affected by secondary paint stripping, S, was obtained. 2，高温 The acceptable threshold is S. 2，高温 ≥90%.

5. The method for detecting the paint removal efficiency of water-based sand-removing agent for exterior walls as described in claim 1, characterized in that, Process S6, based on paint stripping efficiency score D1 Substrate protection dimension Score D2 and environmental adaptability dimension Score D3 The overall score is obtained, including: Based on the three component-level scores of process S6 output, a comprehensive score is calculated using fixed weighting coefficients: Overall score = 0.50 × Score D1 +0.30×Score D2 +0.20×Score D3 .

6. The method for detecting the paint removal efficiency of water-based sand-coated paint remover for exterior walls as described in claim 5, characterized in that, Process S7, based on standardized basic calculation parameters and comprehensive scores, employs a dual-condition approach to determine the product's pass / fail status, resulting in a final inspection report, including: Based on the standardized basic calculation parameters of process S4 and the comprehensive score of process S6, a dual-condition judgment is made on the product's qualification status. Four types of fatal defects are set as veto conditions. If any condition is triggered, regardless of the comprehensive score value, the remover is directly judged as unqualified. V1: Average sludge rate P after aggregation drip >20%; V2: The average percentage of secondary paint stripping area after aggregation is S2 < 90%; V3: pH < 4 or pH > 10 at any test point under any high or low temperature conditions; V4: Under any operating conditions of high or low temperature, the paint remover will show layering, clumping or irreversible deterioration within 12 hours; If none of the four veto conditions are triggered, the performance evaluation of the remover is completed based on the comprehensive score, and the final test judgment report is output.

Images