Standardized evaluation method for application performance of putty powder

Abstract

The invention relates to a putty powder application performance standardization evaluation method. The method comprises the following steps: S1, determining putty powder application performance evaluation indexes; the application performance evaluation indexes of the putty powder comprise appearance, stirring workability, batch scraping constructability, coating cracking, activation period, coating rate, polishing property, polishing sand mark, water resistance, surface drying time, recoverable time, surface bubbles, polishing delamination or glaze and matched anti-tearing property. S2, performing simulation construction on the putty powder sample to be detected; s3, a plurality of trained evaluation personnel are selected, and the putty powder application performance evaluation indexes are measured and scored; and S4, analyzing the application performance of the putty powder to be tested according to a scoring result, and judging whether the application performance of the putty powder to be tested meets requirements or not. By exploring a large number of experimental results, the evaluation index for controlling the application performance quality of the putty powder is determined, and the performance advantages of the putty powder product can be objectively and effectively reflected.

Description

Technical Field

[0001] The invention relates to the technical field of coating application, and in particular to a standardized evaluation method for application performance of putty powder. Background Art

[0002] As the market demand for building materials and building decoration continues to increase, putty, as an important material for leveling walls in the process of building decoration, has also developed rapidly. According to incomplete statistics, the national output of putty powder in 2021 was 7.8275 million tons. The early putty industry developed barbarically, which was attributed to the fact that the lime in its main raw material reacted with carbon dioxide in the air to form calcium carbonate, which expanded in volume, causing cracks in the walls and then water leakage in the walls. With the development of the industry, the market demand for putty materials has become higher and higher, and the popular concepts of green, healthy and low-carbon have become popular. Functional putty powder better meets the current consumer demand and has broadened the application market.

[0003] At present, in the industry, the evaluation of the application performance of putty powder is greatly affected by subjective factors, and there is a lack of an objective and reliable evaluation system to measure the actual application performance of putty products. At the same time, most of the putty powder application performance testing indicators are generally limited to physical and chemical properties and the dimensions required by some national standards, which cannot fully reflect the quality level of putty powder application performance and have limited reference value for actual construction.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a putty powder application performance standardization evaluation method.

[0006] The technical solution adopted by the present invention is:

[0007] The present invention provides a putty powder application performance standardization evaluation method, comprising the following steps:

[0008] S1. Determine the evaluation index of putty powder application performance;

[0009] The evaluation indexes of the application performance of the putty powder include appearance, mixing and workability, scraping construction, coating cracking, activation period, coating rate, polishing and polishing marks, water resistance, surface drying time, recyclable time, surface bubbles, polishing delamination or glaze, and matching tear resistance;

[0010] S2, carrying out simulated construction on the putty powder sample to be tested;

[0011] S3. Select several trained evaluators to measure and score the evaluation indexes of the putty powder application performance;

[0012] S4. Analyze the application performance of the putty powder to be tested according to the scoring results to determine whether the application performance of the putty powder to be tested meets the requirements.

[0013] The invention proposes a standardized evaluation method for the application performance of putty powder. By exploring a large number of experimental results, the evaluation index for controlling the application performance quality of putty powder is determined. The method can objectively and effectively reflect the performance advantages of putty powder products, guide the formula adjustment of putty powder products, and has practical reference value.

[0014] Optionally, the test method for the appearance is: visually observing and touching the state of the putty powder after opening the bag to see whether there is caking, crusting, or delamination;

[0015] The testing method of mixing and workability is: visually observe whether there are small pieces of foreign matter and particles of powder wrapped by liquid when mixing powder and liquid;

[0016] The test method of the batch scraping construction performance is: during the batch scraping process, the batch scraping is judged according to the conditions of the batch scraping material, including curling, knife sticking, drying speed, sagging, and film-forming effect;

[0017] The test method for cracking of the coating film is: after the coating film is dried, visually observe whether cracks of different depths and sizes appear on the surface of the coating film, including the width, length and density of the cracks;

[0018] The test method of the activation period is as follows: start timing after the putty is mixed, conduct construction tests every 0.5 hours, and record the time until the putty thickens to the point where construction is impossible;

[0019] The test method of the coating rate is as follows: determine the area S of the coating substrate, weigh the mass M or volume V of the coating consumed after the coating, calculate the coating rate = M / S or V / S, and obtain the amount of paint consumed per unit area;

[0020] The test method for the polishing property and the polishing marks is: 24 hours after construction, the ease with which the putty layer can be completely powdered by polishing with 320-mesh or 400-mesh sandpaper, and the flatness of the coating after polishing;

[0021] The water resistance test method is: after 120 hours of construction and drying, if the construction is carried out at low temperatures in winter, the time can be appropriately extended, and the sanding and sand shedding phenomenon of the putty layer is observed by pouring water on the surface of the substrate and rubbing the putty layer with hands for 5-10 times;

[0022] The test method of the surface drying time is as follows: start timing after the putty is applied, touch it with your finger, and record the time required for the surface to be transformed into a thin, soft and non-sticky film;

[0023] The test method of the recyclable time is: start timing when the putty is applied to the wall, and record the time until the putty on the wall cannot be smoothed after the putty is applied.

[0024] The test method for the surface bubbles is: visually observe the amount of bubbles that appear during the construction of the putty, the amount of residual bubbles after the coating film dries, and the amount of residual holes after grinding;

[0025] The test method for grinding delamination or glaze is: 3 days after construction, use 320-grit sandpaper to perform a grinding test, and visually observe the delamination phenomenon or glaze area ratio caused by mutual peeling between putties or between putties and substrates after grinding;

[0026] The matching tear resistance test method is as follows: after curing N-type putty for 3 days, polish it with 320-mesh sandpaper to remove the floating dust on it, roll-coat a styrene-acrylic emulsion primer with a water content of 20% and a water ratio of ≤20%, and stick a medium-viscosity masking tape with a width of 1.5 cm and a length of 50-100 cm on the surface of the paint film after drying for 48 hours. Lift the paper tape after 1 minute and 24 hours respectively. The angle with the wall when lifting is between 65-85°, and the tear-off speed is about 50 cm / s. Check the contact surface between the masking tape and the paint film, and record the percentage of the tear-off area T.

[0027] According to the above description, the present invention provides an objective and specific testing method by distinguishing the characteristics and adaptability of various evaluation indicators. It has strong feasibility and can ensure that the detection standardization and accuracy of the application performance of putty powder can be steadily improved. It can provide valuable reference information for the selection and research and development of putty powder products.

[0028] Optionally, the evaluation criteria for each of the putty powder application performance evaluation indicators adopt a ten-point system, which is specifically divided into five levels: 1-2 points, 3-4 points, 5-6 points, 7-8 points and 9-10 points.

[0029] Optionally, if the score of the coating cracking evaluation index is less than 9 points, it is judged as a non-conforming item, and if the score of the other evaluation indexes is less than 6 points, it is judged as a non-conforming item;

[0030] A horizontal comparison is made for multiple groups of sample data to obtain a comprehensive evaluation result of the application performance of the putty powder to be tested.

[0031] Optionally, the method of the simulated construction is scraping construction, and the tool for the scraping construction is a wooden-handled scraper and / or a plastering trowel.

[0032] Optionally, the specifications of the wooden handle burlap knife are: thickness 0.5-0.7mm, length 180-200mm, and front width 98-120mm.

[0033] Optionally, the specifications of the plastering trowel are: thickness 0.5-0.7mm, length 235-300mm, and width 89-100mm.

[0034] Optionally, the preparation method of the test substrate for the scraping construction is: the new wall is leveled with plastering gypsum or plastering mortar, and the allowable deviation of verticality and flatness does not exceed 4mm. After the wall is completely dry and flat, putty is scraped and cured for more than 2 days.

[0035] Optionally, during the scraping process, the angle between the scraping tool and the wall is 30-40°, the scraping direction is from top to bottom and from left to right, the number of constructions is 2 times, the interval time is 24-48 hours, and the single coating rate is 700-1500g / m 2 , the construction thickness is 1-2mm. DETAILED DESCRIPTION

[0036] In order to better understand the above technical scheme, the exemplary embodiments of the present invention will be described in more detail below with reference to. Although exemplary embodiments of the present invention are shown, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a clearer and more thorough understanding of the present invention, and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0037] Example 1

[0038] A standardized evaluation method for the application performance of putty powder comprises the following steps:

[0039] S1. Determine the evaluation index of putty powder application performance;

[0040] The evaluation indicators of the application performance of the putty powder include appearance, mixing and workability, scraping and construction performance, coating cracking, activation period, coating rate, polishing and polishing marks, water resistance, surface drying time, recyclable time, surface bubbles, polishing delamination or glaze, and matching tear resistance.

[0041] The appearance test method is: visually observe and touch the state of the putty powder after opening the bag to see if there is caking, crusting, or delamination;

[0042] The testing method of mixing and workability is: visually observe whether there are small pieces of foreign matter and particles of powder wrapped by liquid when mixing powder and liquid;

[0043] The test method of the batch scraping construction performance is: during the batch scraping process, the batch scraping is judged according to the conditions of the batch scraping material, including curling, knife sticking, drying speed, sagging, and film-forming effect;

[0044] The test method for cracking of the coating film is: after the coating film is dried, visually observe whether cracks of different depths and sizes appear on the surface of the coating film, including the width, length and density of the cracks;

[0045] The test method of the activation period is as follows: start timing after the putty is mixed, conduct construction tests every 0.5 hours, and record the time until the putty thickens to the point where construction is impossible;

[0046] The test method of the coating rate is as follows: determine the area S of the coating substrate, weigh the mass M or volume V of the coating consumed after the coating, calculate the coating rate = M / S or V / S, and obtain the amount of paint consumed per unit area;

[0047] The test method for the polishing property and the polishing marks is: 24 hours after construction, the ease with which the putty layer can be completely powdered by polishing with 320-mesh or 400-mesh sandpaper, and the flatness of the coating after polishing;

[0048] The water resistance test method is: after 120 hours of construction and drying, if the construction is carried out at low temperatures in winter, the time can be appropriately extended, and the sanding and sand shedding phenomenon of the putty layer is observed by pouring water on the surface of the substrate and rubbing the putty layer with hands for 5-10 times;

[0049] The test method of the surface drying time is as follows: start timing after the putty is applied, touch it with your finger, and record the time required for the surface to be transformed into a thin, soft and non-sticky film;

[0050] The test method of the recyclable time is: start timing when the putty is applied to the wall, and record the time until the putty on the wall cannot be smoothed after the putty is applied.

[0051] The test method for the surface bubbles is: visually observe the amount of bubbles that appear during the construction of the putty, the amount of residual bubbles after the coating film dries, and the amount of residual holes after grinding;

[0052] The test method for grinding delamination or glaze is: 3 days after construction, use 320-grit sandpaper to perform a grinding test, and visually observe the delamination phenomenon or glaze area ratio caused by mutual peeling between putties or between putties and substrates after grinding;

[0053] The matching tear resistance test method is as follows: after curing N-type putty for 3 days, polish it with 320-mesh sandpaper to remove the floating dust on it, roll-coat a styrene-acrylic emulsion primer with a water content of 20% and a water ratio of ≤20%, and stick a medium-viscosity masking tape with a width of 1.5 cm and a length of 50-100 cm on the surface of the paint film after drying for 48 hours. Lift the paper tape after 1 minute and 24 hours respectively. The angle with the wall when lifting is between 65-85°, and the tear-off speed is about 50 cm / s. Check the contact surface between the masking tape and the paint film, and record the percentage of the tear-off area T.

[0054] S2. Carry out simulated construction on the putty powder sample to be tested.

[0055] Wherein, the method of simulated construction is scraping construction, and the tool of scraping construction is a wooden-handled scraping knife and / or a plastering trowel.

[0056] The specifications of the wooden handle burlap knife are as follows: thickness is 0.5-0.7mm, length is 180-200mm, and front width is 98-120mm.

[0057] The specifications of the plastering trowel are as follows: thickness is 0.5-0.7mm, length is 235-300mm, and width is 89-100mm.

[0058] The preparation method of the test substrate for the scraping construction is: the new wall is leveled with plaster gypsum or plaster mortar, and the allowable deviation of verticality and flatness does not exceed 4mm. After the wall is completely dry and flat, putty is scraped and cured for more than 2 days.

[0059] During the scraping process, the angle between the scraping tool and the wall is 30-40°, the scraping direction is from top to bottom and from left to right, the construction number is 2 times, the interval time is 24-48h, and the single coating rate is 700-1500g / m 2 , the construction thickness is 1-2mm.

[0060] S3. Select several trained evaluators to measure and score the evaluation indexes of the putty powder application performance.

[0061] Among them, the evaluation standards of each of the putty powder application performance evaluation indicators adopt a ten-point system, which is specifically divided into five levels: 1-2 points, 3-4 points, 5-6 points, 7-8 points and 9-10 points.

[0062] In this embodiment, a typical scoring standard for the application performance of putty powder is provided, and a table is prepared according to the test methods and evaluation standards of the evaluation indicators of the application performance of putty powder, as shown in Table 1 below.

[0063] S4. Analyze the application performance of the putty powder to be tested according to the scoring results to determine whether the application performance of the putty powder to be tested meets the requirements.

[0064] Among them, the coating cracking evaluation index with a score lower than 9 points is judged as unqualified, and the scores of the other evaluation indicators with a score lower than 6 points are judged as unqualified;

[0065] A horizontal comparison is made for multiple groups of sample data to obtain a comprehensive evaluation result of the application performance of the putty powder to be tested.

[0066] Table 1

[0067]

[0068]

[0069]

[0070] Example 2

[0071] The difference between this embodiment and embodiment 1 is that different putty powder samples are used, and the results are tabulated as shown in Table 2. The remaining steps remain unchanged.

[0072] Table 2

[0073]

[0074]

[0075]

[0076] It can be seen from Table 1 and Table 2 that although the evaluation criteria of the present invention are based on manual scoring, they reduce the influence of subjective factors on the scoring, and provide a more objective evaluation criteria for distinguishing the application performance of putty powder. The quantified scores can directly correspond to the actual application performance of putty powder, which has strong operability and is conducive to building a scientific putty powder application performance evaluation system.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A standardized evaluation method for the application performance of putty powder, comprising the following steps: S1. Determine the evaluation index of putty powder application performance; The evaluation indexes of the application performance of the putty powder include appearance, mixing and workability, scraping construction, coating cracking, activation period, coating rate, polishing and polishing marks, water resistance, surface drying time, recyclable time, surface bubbles, polishing delamination or glaze, and matching tear resistance; S2, carrying out simulated construction on the putty powder sample to be tested; S3. Select several trained evaluators to measure and score the evaluation indexes of the putty powder application performance; S4. Analyze the application performance of the putty powder to be tested according to the scoring results to determine whether the application performance of the putty powder to be tested meets the requirements.

2. The putty powder application performance standardization evaluation method according to claim 1, characterized in that: The test method for the appearance is: visually observe and touch the state of the putty powder after opening the bag to see if there is caking, crusting, or delamination; The testing method of mixing and workability is: visually observe whether there are small pieces of foreign matter and particles of powder wrapped by liquid when mixing powder and liquid; The test method of the batch scraping construction performance is: during the batch scraping process, the batch scraping is judged according to the conditions of the batch scraping material, including curling, knife sticking, drying speed, sagging, and film-forming effect; The test method for cracking of the coating film is: after the coating film is dried, visually observe whether cracks of different depths and sizes appear on the surface of the coating film, including the width, length and density of the cracks; The test method of the activation period is as follows: start timing after the putty is mixed, conduct construction tests every 0.5 hours, and record the time until the putty thickens to the point where construction is impossible; The test method of the coating rate is as follows: determine the area S of the coating substrate, weigh the mass M or volume V of the coating consumed after the coating, calculate the coating rate = M / S or V / S, and obtain the amount of paint consumed per unit area; The test method for the polishing property and the polishing marks is: 24 hours after construction, the ease with which the putty layer can be completely powdered by polishing with 320-mesh or 400-mesh sandpaper, and the flatness of the coating after polishing; The water resistance test method is: after 120 hours of construction and drying, if the construction is carried out at low temperatures in winter, the time can be appropriately extended, and the sanding and sand shedding phenomenon of the putty layer is observed by pouring water on the surface of the substrate and rubbing the putty layer with hands for 5-10 times; The test method of the surface drying time is as follows: start timing after the putty is applied, touch it with your finger, and record the time required for the surface to be transformed into a thin, soft and non-sticky film; The test method of the recyclable time is: start timing when the putty is applied to the wall, and record the time until the putty on the wall cannot be smoothed after the putty is applied. The surface bubble test method is: visually observe the amount of bubbles that appear during the construction of the putty, the amount of residual bubbles after the coating film dries, and the amount of residual holes after grinding; The test method for grinding delamination or glaze is: 3 days after construction, use 320-grit sandpaper to perform a grinding test, and visually observe the delamination phenomenon or glaze area ratio caused by mutual peeling between putties or between putties and substrates after grinding; The matching tear resistance test method is as follows: after curing N-type putty for 3 days, polish it with 320-mesh sandpaper to remove the floating dust on it, roll-coat a styrene-acrylic emulsion primer with a water content of 20% and a water ratio of ≤20%, and stick a medium-viscosity masking tape with a width of 1.5 cm and a length of 50-100 cm on the surface of the paint film after drying for 48 hours. Lift the paper tape after 1 minute and 24 hours respectively. The angle with the wall when lifting is between 65-85°, and the tear-off speed is about 50 cm / s. Check the contact surface between the masking tape and the paint film, and record the percentage of the tear-off area T.

3. The putty powder application performance standardization evaluation method according to claim 1, characterized in that: The evaluation criteria for each of the putty powder application performance evaluation indicators are based on a 10-point system, specifically divided into five levels: 1-2 points, 3-4 points, 5-6 points, 7-8 points and 9-10 points.

4. The putty powder application performance standardization evaluation method according to claim 3, characterized in that: If the score of the coating cracking evaluation index is less than 9 points, it is judged as unqualified, and if the score of the other evaluation indicators is less than 6 points, it is judged as unqualified; A horizontal comparison is made for multiple groups of sample data to obtain a comprehensive evaluation result of the application performance of the putty powder to be tested.

5. The putty powder application performance standardization evaluation method according to claim 1, characterized in that: The method of the simulated construction is scraping construction, and the tool of the scraping construction is a wooden-handled scraping knife and / or a plastering trowel.

6. The standardized evaluation method for application performance of putty powder according to claim 5, characterized in that: The specifications of the wooden handle burlap knife are as follows: thickness is 0.5-0.7mm, length is 180-200mm, and front width is 98-120mm.

7. The putty powder application performance standardization evaluation method according to claim 5, characterized in that: The specifications of the plastering trowel are as follows: thickness is 0.5-0.7mm, length is 235-300mm, and width is 89-100mm.

8. The putty powder application performance standardization evaluation method according to claim 5, characterized in that: The preparation method of the test substrate for the scraping construction is: the new wall is leveled with plaster gypsum or plaster mortar, and the allowable deviation of verticality and flatness does not exceed 4mm. After the wall is completely dry and flat, putty is scraped and cured for more than 2 days.

9. The putty powder application performance standardization evaluation method according to claim 8, characterized in that: During the scraping process, the angle between the scraping tool and the wall is 30-40°, the scraping direction is from top to bottom and from left to right, the construction number is 2 times, the interval time is 24-48h, and the single coating rate is 700-1500g / m 2 , the construction thickness is 1-2mm.

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