Method for detecting storage water diversion degree of latex paint

Abstract

According to the method for detecting the storage water diversion degree of the emulsion paint, the emulsion paint is tested and represented by two instruments, namely the centrifugal machine and the suspended matter tester after being diluted, and the grade evaluation of the storage water diversion degree of the emulsion paint is realized; the method can be used for accurately, quickly and quantitatively testing the storage water diversion degree of the latex paint. The method can rapidly measure the storage water diversion degree of the emulsion paint, can improve the design efficiency of an emulsion paint formula, reduces the time cost, and has important significance for the research of a detection method of the storage water diversion degree of the emulsion paint.

Description

Technical Field

[0001] The invention belongs to the field of building latex paint performance detection, relates to the performance of the appearance of latex paint during long-term storage, and specifically relates to a method for detecting the degree of water separation of latex paint during storage. Background Art

[0002] Latex paint stratification refers to the appearance of a layer of clear or light yellow liquid substance, which is mostly water, on the surface of latex paint during the production or storage process, and a viscous or paste-like mixture of pigments, fillers and emulsions at the bottom, that is, the emulsion system has undergone obvious stratification.

[0003] When designing a latex paint formula, it is necessary to quickly test whether there are some defects in the formula. Storage stratification affects the appearance of the paint. In severe cases, the paint will settle and demulsify.

[0004] At present, there is no patent for the test method of water separation during storage of latex paint. The commonly used method for testing water separation during storage of latex paint is:

[0005] The degree of water separation of latex paint after long-term storage at 55°C in a constant temperature and humidity oven for 28 days under the influence of gravity and Brownian motion. This method takes a long time and is not conducive to the technical developers to improve their work efficiency when designing the formula. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a method for detecting the degree of water separation in storage of latex paint, which is a method that can accurately, quickly and quantitatively test the degree of water separation in storage of latex paint. The latex paint is diluted and tested and characterized by two instruments, a centrifuge and a suspended matter tester, and the degree of water separation in storage of latex paint can be graded.

[0007] To solve the above problems, the present invention is implemented through the following technical solutions:

[0008] The method for detecting the degree of water separation during storage of latex paint of the present invention comprises the following steps:

[0009] A. Preparation of latex paint samples: dilute the latex paint according to the mass ratio of latex paint to water of 9:1 and stir evenly. Use a specific gravity cup to measure the specific gravity ρ1 after dilution. The sample volume V0 is:

[0010] M 水 =V0*ρ1*10 / 100

[0011] B. Use a centrifuge at 2000 rpm for 10 minutes and measure the volume V1 of the supernatant after centrifugation, which is the weight M. 上 ; The specific gravity of the supernatant is 1g / cm 3 Calculate. The water separation rate is recorded as P;

[0012] C. Use the formula:

[0013] P=M 上 / M 水

[0014] The calculated test results show that the smaller the P value is, the less likely the latex paint is to delaminate and the better the water retention of the system is.

[0015] When DP≤0.1, the amount of clear liquid is small and difficult to collect, and the suspended matter score E is recorded as 0;

[0016] When P>0.1, the supernatant from the centrifuge is tested for suspended matter, and the test result score E is obtained according to the obtained SS value:

[0017] SS value PPM 0-199 200-399 400-599 600-799 800 and above Score E 1 2 3 4 5

[0018] E. Comprehensive score of the centrifuge volume and suspended solids in the centrifuge:

[0019] Q=5-P+0.01*E.

[0020] The detection method of the water separation degree of latex paint storage of the present invention is further optimized as follows:

[0021] The latex paint is latex paint for interior and exterior walls of buildings.

[0022] The detection method of the water separation degree of latex paint storage of the present invention is further optimized as follows:

[0023] The diluted latex paint in step A is stirred evenly by using a high-speed disperser for mixing at a speed of 900 to 1100 rpms for 10 to 15 minutes and allowed to stand for 1 hour.

[0024] The detection method of the water separation degree of latex paint storage of the present invention is further optimized as follows:

[0025] The centrifuge tube used for the sample of the centrifuge is 10mL.

[0026] The detection method of the water separation degree of latex paint storage of the present invention is further optimized as follows:

[0027] The suspended matter test adopts a suspended matter tester, which is an instrument that measures the attenuation of light generated by insoluble particulate matter in the clear liquid and can quantitatively characterize the content of these suspended particulate matter.

[0028] The detection method of the water separation degree of latex paint storage of the present invention is further optimized as follows:

[0029] It also includes the steps of:

[0030] F. Rating:

[0031] When Q=5, the water separation level of latex paint storage is perfect when there is no stratification;

[0032] When 4≤Q<5, the water separation level of latex paint storage is excellent;

[0033] When 3.5≤Q<4, the water separation level of latex paint during storage is good;

[0034] When 2.5≤Q<3.5, the water separation level of latex paint storage is average;

[0035] When Q is less than 2.5, the degree of water separation during storage of latex paint is very poor.

[0036] The grade determination criteria are determined based on two factors:

[0037] 1. After the test is completed, detect the supernatant separated from the 10mL test tube. When P≤0.1, the supernatant in the test tube is difficult to collect, or very little supernatant is visible; when P>0.1, the supernatant in the test tube is clearly visible and easy to collect.

[0038] 2. Through the supernatant liquid test of a large number of latex paint samples, the test results obtained are comprehensively analyzed, sorted in order of performance, and compared with the corresponding supernatant liquid suspended matter score E.

[0039] Taking the above two factors into consideration, a certain level division can be carried out according to the Q value of the test result obtained; the level determination of the present invention is divided into the above 5 levels.

[0040] In practical applications, the degree of water separation of latex paint is divided into grades according to the Q value, which is conducive to quickly determining the degree of water separation during storage of the latex paint system.

[0041] The different degrees of water separation of latex paint have an important impact on improving the development efficiency of latex paint technology and its later storage. Therefore, it is of great significance to study the detection method of the water separation degree of latex paint.

[0042] The purpose of the method for detecting the water separation degree of latex paint of the present invention is to realize a simple and efficient method for testing the performance of the water separation degree of latex paint, and its advantages are:

[0043] 1. Realize rapid detection and analysis of the water separation degree of latex paint;

[0044] 2. It is beneficial to improve the efficiency of latex paint product development, and the test results provide a reference for development;

[0045] 3. Quantitative evaluation of the degree of water separation of latex paint is helpful to quickly judge the quality of product stratification during long-term storage.

[0046] The detection method of water separation degree of latex paint of the present invention has the following advantages:

[0047] 1. The test method for the water separation degree of latex paint during storage of the present invention can save 24 days compared with the conventional method, and can greatly improve work efficiency, save time and cost.

[0048] The method for testing the degree of water separation during storage of latex paint of the present invention is significantly different from the traditional water separation test:

[0049] a. Rapidly test the water separation of latex paint using a centrifuge;

[0050] b. No need to wait 28 days to see the results. Compared with traditional tests, the water separation efficiency is greatly improved. The use of suspended matter tester is conducive to improving the classification of water separation degree.

[0051] 2. The technical solution of the present invention provides a new method for detecting the degree of water separation in storage of latex paint. The biggest difference from the existing test method lies in the difference in the test method (the existing test method is: latex paint is sealed and stored at 55°C for 28 days). The calculation formula of the test result is that this method is applied for the first time in the test method for the degree of water separation. The measurement results are calculated using the formula to quantitatively characterize the degree of water separation of latex paint. The test method has the advantages of intuitive results, small errors, and efficient process.

[0052] The detection method of the water separation degree of latex paint of the present invention has the following characteristics:

[0053] 1. During the sample preparation process, the shear force is lower than the shear force in the pulping stage of the water-based paint system, and only water is added to the latex paint for dilution. Amplifying the water separation is beneficial to improving the accuracy of the test results.

[0054] 2. The water separation process of latex paint is simple. During the test, you only need to put the sample into the centrifuge for testing. The testing process is fast and efficient, which improves the practical value of this method.

[0055] 3. The test results are presented in specific numerical values, which can intuitively and quantitatively present the quality of the water separation of latex paint. We can quickly distinguish the differences in the water separation performance of latex paints of different products and the stability of different batches of the same product through the value Q.

[0056] 4. At the same time, the performance level range of the latex paint product can be preliminarily determined based on the Q value, and the required products can be screened out for relevant analysis and research to improve work efficiency. DETAILED DESCRIPTION

[0057] In order to make the application, technical scheme and advantages of the present invention more clearly understood, the present invention is described in detail in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not limited to the present invention. All simple improvements to the preparation method of the present invention under the premise of the present invention are within the protection scope of the present invention.

[0058] Example 1: A method for detecting the degree of water separation during storage of latex paint

[0059] The method for detecting the degree of water separation during storage of latex paint of the present invention comprises the following steps:

[0060] A. Preparation of latex paint samples: dilute the latex paint according to the mass ratio of latex paint to water of 9:1 and stir evenly. Use a specific gravity cup to measure the specific gravity ρ1 after dilution. The sample volume V0 is:

[0061] M 水 =V0*ρ1*10 / 100

[0062] B. Use a centrifuge at 2000 rpm for 10 minutes and measure the volume V1 of the supernatant after centrifugation, which is the weight M. 上 ; The specific gravity of the supernatant is 1g / cm 3 Calculate. The water separation rate is recorded as P;

[0063] C. Use the formula:

[0064] P=M 上 / M 水

[0065] The calculated test results show that the smaller the P value is, the less likely the latex paint is to delaminate and the better the water retention of the system is.

[0066] When DP≤0.1, the amount of clear liquid is small and difficult to collect, and the suspended matter score E is recorded as 0;

[0067] When P>0.1, the supernatant from the centrifuge is tested for suspended matter, and the test result score E is obtained according to the obtained SS value:

[0068] SS value PPM 0-199 200-399 400-599 600-799 800 and above Score E 1 2 3 4 5

[0069] E. Comprehensive score of the centrifuge volume and suspended solids in the centrifuge:

[0070] Q = 5-P + 0.01*E;

[0071] F. Rating:

[0072] When Q=5, the water separation level of latex paint storage is perfect when there is no stratification;

[0073] When 4≤Q<5, the water separation level of latex paint storage is excellent;

[0074] When 3.5≤Q<4, the water separation level of latex paint during storage is good;

[0075] When 2.5≤Q<3.5, the water separation level of latex paint storage is average;

[0076] When Q is less than 2.5, the degree of water separation during storage of latex paint is very poor.

[0077] The detection method of the water separation degree of latex paint storage of the present invention is further optimized as follows:

[0078] The latex paint is latex paint for interior and exterior walls of buildings.

[0079] The detection method of the water separation degree of latex paint storage of the present invention is further optimized as follows:

[0080] The diluted latex paint in step A is stirred evenly by using a high-speed disperser for mixing at a speed of 900 to 1100 rpms for 10 to 15 minutes and allowed to stand for 1 hour.

[0081] The detection method of the water separation degree of latex paint storage of the present invention is further optimized as follows:

[0082] The centrifuge tube used for the sample of the centrifuge is 10mL.

[0083] The detection method of the water separation degree of latex paint storage of the present invention is further optimized as follows:

[0084] The suspended matter test adopts a suspended matter tester, which is an instrument that measures the attenuation of light generated by insoluble particulate matter in the clear liquid and can quantitatively characterize the content of these suspended particulate matter.

[0085] The detection method of the water separation degree of latex paint storage of the present invention is further optimized as follows:

[0086] Table 1 below is a comparison of the application of the detection method of the present invention and the experimental results of water separation in latex paint storage with those of the conventional method:

[0087] Table 1 Sample test of the detection method of the present invention and the existing method

[0088]

[0089] The test results of the water separation degree of latex paint storage are:

[0090] The sample 1 system is very stable and has no water separation;

[0091] Samples 4 and 5 have serious stratification, and the system is the most unstable;

[0092] The delamination of samples 2 and 3 is not serious.

[0093] The method of the present invention can accurately and quickly test the storage stratification differences of 5 latex paint samples of different products through the obtained Q value. From the test results of the Q value, it can be seen that sample 1 is significantly better than the other samples. The results obtained by the method of the present invention are basically consistent with those obtained by the existing method.

[0094] Based on the test results obtained from the above practical applications, the method of the present invention can more accurately and quickly determine the performance quality of the water separation degree of latex paint during storage.

[0095] To sum up, the above are only preferred embodiments of the present invention and are not intended to limit the present invention in any form. Any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the present invention using the disclosed technical content are regarded as equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the technical solution of the present invention.

[0096] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0097] The experimental methods without specific conditions in the present invention are usually carried out under conventional conditions or conditions recommended by the manufacturer.

[0098] Unless otherwise stated, the various optimization technical solutions in the present invention can be combined with each other.

[0099] Unless otherwise indicated, percentages and parts are by weight.

[0100] Experimental methods without specific conditions specified in the instructions and examples are usually carried out under conventional conditions or conditions recommended by the manufacturers.

[0101] Unless otherwise defined, all professional and scientific terms used herein have the same meaning as those familiar to those skilled in the art. In addition, any method and material similar or equivalent to the described content can be applied to the method of the present invention.

Claims

1. A method for detecting the degree of water separation during storage of latex paint, characterized in that: It includes the following steps: A. Preparation of latex paint samples: dilute the latex paint according to the mass ratio of latex paint to water of 9:1 and stir evenly. Use a specific gravity cup to measure the specific gravity ρ1 after dilution. The sample volume V0 is: M 水 =V0*ρ1*10 / 100 B. Use a centrifuge at 2000 rpm for 10 minutes and measure the volume V1 of the supernatant after centrifugation, which is the weight M. 上 ; The specific gravity of the supernatant is 1g / cm 3 Calculate. The water separation rate is recorded as P; C. Use the formula: P=M 上 / M 水 The calculated test results show that the smaller the P value is, the less likely the latex paint is to delaminate and the better the water retention of the system is. When DP≤0.1, the amount of clear liquid is small and difficult to collect, and the suspended matter score E is recorded as 0; When P>0.1, the supernatant from the centrifuge is tested for suspended matter, and the test result score E is obtained according to the obtained SS value: E. Comprehensive score of the centrifuge volume and suspended solids in the centrifuge: Q=5-P+0.01*E.

2. The method for detecting the degree of water separation during storage of latex paint according to claim 1, characterized in that: It also includes the steps of: F. Rating: When Q=5, the water separation level of latex paint storage is perfect when there is no stratification; When 4≤Q<5, the water separation level of latex paint storage is excellent; When 3.5≤Q<4, the water separation level of latex paint during storage is good; When 2.5≤Q<3.5, the water separation level of latex paint storage is average; When Q is less than 2.5, the degree of water separation during storage of latex paint is very poor.

3. The method for detecting the degree of water separation during storage of latex paint according to claim 1, characterized in that: The latex paint is latex paint for interior and exterior walls of buildings.

4. The method for detecting the degree of water separation during storage of latex paint according to claim 1, characterized in that: The diluted latex paint in step A is stirred evenly by using a high-speed disperser for mixing at a speed of 900 to 1100 rpms for 10 to 15 minutes and allowed to stand for 1 hour.

5. The method for detecting the degree of water separation during storage of latex paint according to claim 1, characterized in that: The centrifuge tube used for the sample of the centrifuge is 10mL.

6. The method for detecting the degree of water separation during storage of latex paint according to claim 1, characterized in that: The suspended matter test adopts a suspended matter tester, which is an instrument that measures the attenuation of light generated by insoluble particulate matter in the clear liquid and can quantitatively characterize the content of these suspended particulate matter.

Images