Method for detecting solid content of water-based wax

Abstract

The invention relates to a method for detecting the solid content of water-based wax, which comprises the following steps of: drying a water-based wax sample by adopting gradient heating, and calculating the solid content of the water-based wax by utilizing the following formula: solid content = (dried water-based wax sample / water-based wax sample before drying) * 100%. According to the method, the water-based wax sample is dried by adopting a gradient heating method, so that compared with the traditional method for drying the water-based wax at a single temperature, a more excellent separation effect on water and a solvent can be realized, and the tested solid content of the water-based wax is more accurate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of material detection, and in particular to a method for detecting solid content of water-based wax. BACKGROUND

[0002] Solid content is an important parameter of wax products. The solid content of wax, also known as solid content or solid content, refers to the weight percentage of the solid wax component that actually plays a role in the wax emulsion or wax dispersion. In simple terms, after all the water and solvent in the liquid wax product are completely evaporated, the mass percentage of the remaining solid wax to the total mass. This percentage involves key factors such as cost and quality, and is an important indicator of material control. It is directly related to the performance, dosage and cost of the product.

[0003] By adding wax to downstream products, the downstream products can be given properties such as wear resistance, scratch resistance, anti-blocking, and smooth feel, and these effects are mainly provided by solid wax. The higher the solid content of the wax, the denser the wax film formed and the better the performance. The amount of product needed to achieve the desired wax film thickness and technical effect can also be calculated by accurately calculating the solid content of the wax. And solid content is a key quality control point in the production process. The stability of the solid content between batches can ensure the stability of the performance of the final product. In addition, considering the production cost, the price of high-solid wax products is higher, but because of the high effective ingredient, it may be more economical after dilution. When comparing different products, the price should be compared under the same solid content.

[0004] Therefore, testing the solid content of the wax not only ensures the high quality and consistency of the product, but also provides significant advantages in cost control, environmental compliance, customer satisfaction and market competitiveness.

[0005] In the prior art, the method for testing the solid content of the wax is to place the wax at a fixed temperature for drying treatment. However, if the wax is directly placed at high temperature (the boiling point of high-boiling-point solvents in the wax is generally higher than that of water) for drying, a wax film is easily formed on the surface in contact with the environment, which prevents the water from evaporating, resulting in inaccurate measurement of the solid content and affecting subsequent use.

[0006] Therefore, it has become a problem to be solved to provide a method for more accurately detecting the solid content of water-based wax. SUMMARY

[0007] To solve the above technical problems, the present application provides a method for detecting the solid content of water-based wax, which can more accurately detect the solid content of water-based wax.

[0008] To achieve this purpose, the present application adopts the following technical solutions:

[0009] In a first aspect, the present application provides a method for detecting the solid content of an aqueous wax, the method comprising drying the aqueous wax sample using gradient heating, and calculating the solid content of the aqueous wax using the following formula:

[0010] Solid content = (dried aqueous wax sample / dried aqueous wax sample) x 100%.

[0011] The present application dries the aqueous wax sample using gradient heating, which can achieve a more excellent separation effect of water and solvent compared to the traditional drying of aqueous wax at a single temperature, and the solid content of the aqueous wax obtained by testing is more accurate.

[0012] Preferably, the drying is performed under vacuum.

[0013] Preferably, the vacuum degree of the vacuum is 100-150 Pa, for example, it can be 100 Pa, 110 Pa, 120 Pa, 130 Pa, 140 Pa or 150 Pa, etc.

[0014] The present application limits the drying to be performed under vacuum to avoid the influence of the accuracy of the detection caused by the absorption of water vapor in the environment by the dried aqueous wax sample.

[0015] Preferably, the gradient heating comprises n independent temperature intervals, 2≤n≤24, and n is an integer, for example, n can be 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23 or 24, etc.

[0016] The temperature interval of the present application refers to the temperature corresponding to the drying of the aqueous wax at different temperatures within a certain time, and the temperature interval is not counted during the heating process.

[0017] Preferably, the temperature difference between the temperature intervals is independently 1-24℃, for example, it can be 1℃, 2℃, 3℃, 4℃, 5℃, 6℃, 7℃, 8℃, 9℃, 10℃, 11℃, 12℃, 13℃, 14℃, 15℃, 16℃, 17℃, 18℃, 19℃, 20℃, 21℃, 22℃, 23℃ or 24℃, etc.

[0018] Preferably, the temperature difference between the temperature intervals is independently 1-24℃, for example, it can be 1℃, 2℃, 3℃, 4℃, 5℃, 6℃, 7℃, 8℃, 9℃, 10℃, 11℃, 12℃, 13℃, 14℃, 15℃, 16℃, 17℃, 18℃, 19℃, 20℃, 21℃, 22℃, 23℃ or 24℃, etc.

[0019] Preferably, n is 4-6, and the temperature difference between the temperature intervals is 2-6℃, for example, it can be 2℃, 3℃, 4℃, 5℃ or 6℃, etc.

[0020] Since the temperature span of the present application is small, if the temperature resolution of 0.1℃ is to be achieved stably, more precise instruments are needed. Although the existing vacuum drying oven can achieve a temperature resolution of 0.1℃, due to external reasons such as vacuum, there is often a constant temperature fluctuation of ±1℃, so the present application preferably performs testing with a temperature resolution of 1℃.

[0021] Preferably, the temperature of the starting interval of the temperature interval is 98-102℃, for example, it can be 98℃, 99℃, 100℃, 101℃ or 102℃, etc.

[0022] Preferably, the temperature of the final interval of the temperature interval is 118-122℃, for example, it can be 118℃, 119℃, 120℃, 121℃ or 122℃, etc.

[0023] Preferably, the total drying time is 1-6 h, for example, it can be 1 h, 1.25 h, 1.5 h, 1.75 h, 2 h, 2.25 h, 2.5 h, 2.75 h, 3 h, 3.25 h, 3.5 h, 3.75 h, 4 h, 4.25 h, 4.5 h, 4.75 h, 5 h, 5.25 h, 5.5 h, 5.75 h or 6 h, etc.

[0024] Preferably, the drying time of the aqueous wax sample at each temperature interval is independently 10-90 min, for example, it can be 10 min, 15 min, 20 min, 30 min, 40 min, 50 min, 60 min, 70 min, 80 min or 90 min, etc.

[0025] Preferably, the drying time of the aqueous wax sample at the starting interval is 50-70 min, for example, it can be 50 min, 55 min, 60 min, 65 min or 70 min, etc.

[0026] The aqueous wax cannot be measured by the conventional single temperature drying method, because direct heating to a higher temperature, the surface of the aqueous wax in contact with the environment is easy to form a wax film, causing the water to be unable to evaporate, resulting in inaccurate measurement of the solid content, which affects the subsequent use. The present application uses a gradient heating method to dry the aqueous wax sample first at the boiling point of water to ensure that the moisture is analyzed out, and at the same time the wax film will not be formed, which cannot prevent the evaporation of water, ensuring the accuracy of the test results, and then gradually heating to the boiling point of the solvent in the aqueous wax, drying, in this process, a wax film will gradually form, since the wax film is relatively delicate and smooth, so it needs longer drying time to overflow the solvent in the film, and the measurement result is more accurate.

[0027] Preferably, during the drying process, the aqueous wax sample is placed in a container.

[0028] Preferably, the areal density of the water-based wax sample in the container is 0.2-0.3 g / cm³. 2 For example, it could be 0.2 g / cm³. 2 0.22 g / cm 2 0.24 g / cm 2 0.25 g / cm 2 0.26 g / cm 2 0.28 g / cm 2 Or 0.3 g / cm 2 wait.

[0029] Preferably, the drying process is carried out in a sealed heating device.

[0030] Preferably, the sealing heating device is preheated.

[0031] Preferably, the temperature after preheating in the sealed heating device is 98-102℃, for example, it can be 98℃, 99℃, 100℃, 101℃ or 102℃, etc.

[0032] Preferably, the heating device includes a vacuum drying oven or a baking oven.

[0033] Preferably, after the drying process, the water-based wax sample is cooled to 20-30°C under vacuum conditions in a sealed heating device, for example, 20°C, 22°C, 24°C, 25°C, 26°C, 28°C, or 30°C.

[0034] Compared with the prior art, the present invention has at least the following beneficial effects:

[0035] This invention uses a gradient heating method to dry water-based wax samples. Compared with the traditional method of drying water-based wax at a single temperature, it can achieve a better separation effect of water and solvent, and the measured solid content of water-based wax is more accurate. Detailed Implementation

[0036] To facilitate understanding of the present invention, the following embodiments are provided. Those skilled in the art should understand that these embodiments are merely illustrative and should not be construed as limiting the scope of the invention.

[0037] The specific information of the materials used in the following specific embodiments of the present invention is as follows:

[0038] Example 1

[0039] This embodiment provides a method for detecting the solid content of water-based waxes, the method comprising:

[0040] (1) Take 2 g of water-based wax sample (SP-WAX-180 water-based hard wax produced by Shenyang Pakase Precision Co., Ltd.), and spread it evenly on a 7 cm² area. 2 In the vessel;

[0041] (2) The temperature of the preheated vacuum drying oven (the drying oven is a DZF-6050TE vacuum drying oven from Wuxi Marite Technology Co., Ltd.) is 100℃ and the vacuum degree is 100 Pa. The water-based wax sample is placed in the vacuum drying oven and dried at 100℃ for 1 hour.

[0042] (3) The temperature was increased at a rate of 1℃ / min throughout the process. First, the temperature was increased to the second temperature zone of 105℃ and dried for 36 min. Then, the temperature was increased to the third temperature zone of 108℃ and dried for 36 min. Then, the temperature was increased to the fourth temperature zone of 112℃ and dried for 36 min. Then, the temperature was increased to the fifth temperature zone of 118℃ and dried for 42 min. Then, the temperature was increased to the final temperature zone of 120℃ and dried for 30 min. After drying, the water-based wax sample was cooled to 25℃ in the vacuum drying oven to obtain the dried water-based wax sample and its mass was recorded.

[0043] Example 2

[0044] This embodiment provides a method for detecting the solid content of water-based waxes, the method comprising:

[0045] (1) Take 2 g of water-based wax sample and spread it evenly on a surface with an area of ​​7 cm². 2 In the vessel;

[0046] (2) The temperature of the preheated vacuum drying oven is 102℃ and the vacuum degree is 100 Pa. Place the water-based wax sample in the vacuum drying oven and dry it at 102℃ for 70 min.

[0047] (3) The temperature was increased at a rate of 1℃ / min throughout the process. First, the temperature was increased to the second temperature zone of 108℃ and dried for 1 h. Then, the temperature was increased to the third temperature zone of 114℃ and dried for 1 h. Then, the temperature was increased to the final temperature zone of 118℃ and dried for 45 min. After drying, the water-based wax sample was cooled to 25℃ in the vacuum drying oven to obtain the dried water-based wax sample and its mass was recorded.

[0048] Example 3

[0049] This embodiment provides a method for detecting the solid content of water-based waxes, the method comprising:

[0050] (1) Take 1.5 g of water-based wax sample and spread it evenly on a surface with an area of ​​7 cm². 2 In the vessel;

[0051] (2) The temperature of the preheated vacuum drying oven is 98℃ and the vacuum degree is 100 Pa. Place the water-based wax sample in the vacuum drying oven and dry it at 98℃ for 50 min.

[0052] (3) The temperature is increased at a rate of 1℃ / min throughout the process. First, the temperature is increased to the second temperature zone of 101℃ and dried for 10 min, then to the third temperature zone of 102℃ and dried for 10 min, then to the fourth temperature zone of 103℃ and dried for 10 min, then to the fifth temperature zone of 104℃ and dried for 10 min, then to the sixth temperature zone of 105℃ and dried for 10 min, then to the seventh temperature zone of 106℃ and dried for 10 min, then to the eighth temperature zone of 107℃ and dried for 10 min, then to the ninth temperature zone of 108℃ and dried for 10 min, then to the tenth temperature zone of 109℃ and dried for 10 min, then to the eleventh temperature zone of 110℃ and dried for 10 min, then to the twelfth temperature zone of 111℃ and dried for 10 min, then to the thirteenth temperature zone of 112℃ and dried for 10 min, then to the fourteenth temperature zone of 113℃ and dried for 10 min, then to the fifteenth temperature zone of 114℃ and dried for 10 min. The process involves drying the sample in the following steps: first, at 110°C in the sixteenth temperature zone, then at 116°C in the seventeenth temperature zone, drying for 10 minutes; then at 117°C in the eighteenth temperature zone, drying for 10 minutes; then at 118°C in the nineteenth temperature zone, drying for 10 minutes; then at 119°C in the twentieth temperature zone, drying for 10 minutes; and finally at 122°C in the final temperature zone, drying for 10 minutes. After drying, the water-based wax sample is cooled to 25°C in the vacuum drying oven to obtain the dried water-based wax sample, and its mass is recorded.

[0053] Example 4

[0054] This embodiment provides a method for detecting the solid content of water-based waxes, the method comprising:

[0055] (1) Take 2 g of water-based wax sample and spread it evenly on a surface with an area of ​​7 cm². 2 In the vessel;

[0056] (2) The temperature of the preheated vacuum drying oven is 100℃ and the vacuum degree is 100 Pa. Place the water-based wax sample in the vacuum drying oven and dry it at 100℃ for 1 hour.

[0057] (3) Heat the sample at a rate of 1℃ / min until it reaches the final temperature range of 120℃. Dry for 3 hours. After drying, cool the water-based wax sample to 25℃ in a vacuum drying oven to obtain the dried water-based wax sample and record its mass.

[0058] Example 5

[0059] This embodiment provides a method for detecting the solid content of water-based waxes, the method comprising:

[0060] (1) Take 2 g of water-based wax sample and spread it evenly on a surface with an area of ​​7 cm². 2 In the vessel;

[0061] (2) The temperature of the preheated vacuum drying oven is 100℃ and the vacuum degree is 100 Pa. Place the water-based wax sample in the vacuum drying oven and dry it at 100℃ for 1 h.

[0062] (3) The temperature was increased at a rate of 1℃ / min throughout the process. First, the temperature was increased to the second temperature zone of 104℃ and dried for 16 min. Then, the temperature was increased to the third temperature zone of 106℃ and dried for 16 min. Then, the temperature was increased to the fourth temperature zone of 108℃ and dried for 16 min. Then, the temperature was increased to the fifth temperature zone of 110℃ and dried for 16 min. Then, the temperature was increased to the sixth temperature zone of 112℃ and dried for 16 min. Then, the temperature was increased to the seventh temperature zone of 114℃ and dried for 17 min. Then, the temperature was increased to the eighth temperature zone of 116℃ and dried for 17 min. Then, the temperature was increased to the ninth temperature zone of 117℃ and dried for 17 min. Then, the temperature was increased to the tenth temperature zone of 119℃ and dried for 17 min. Then, the temperature was increased to the final temperature zone of 120℃ and dried for 30 min. After drying, the water-based wax sample was cooled to 25℃ in the vacuum drying oven to obtain the dried water-based wax sample and its mass was recorded.

[0063] Example 6

[0064] This embodiment provides a method for detecting the solid content of water-based waxes, the method comprising:

[0065] (1) Take 2 g of water-based wax sample and spread it evenly on a surface with an area of ​​7 cm². 2 In the vessel;

[0066] (2) The temperature of the preheated vacuum drying oven is 100℃ and the vacuum degree is 100 Pa. Place the water-based wax sample in the vacuum drying oven and dry it at 100℃ for 1 h.

[0067] (3) The temperature was increased at a rate of 1℃ / min throughout the process. First, the temperature was increased to the second temperature zone of 108℃ and dried for 65 min. Then, the temperature was increased to the third temperature zone of 114℃ and dried for 65 min. Finally, the temperature was increased to the final temperature zone of 120℃ and dried for 50 min. After drying, the water-based wax sample was cooled to 25℃ in the vacuum drying oven to obtain the dried water-based wax sample and its mass was recorded.

[0068] Example 7

[0069] This embodiment provides a method for detecting the solid content of water-based waxes, the method comprising:

[0070] (1) Take 2 g of water-based wax sample and spread it evenly on a surface with an area of ​​7 cm².2 In the vessel;

[0071] (2) The temperature of the preheated vacuum drying oven is 98℃ and the vacuum degree is 100 Pa. The water-based wax sample is placed in the vacuum drying oven and dried at 98℃ for 1 h.

[0072] (3) The temperature was increased at a rate of 1℃ / min throughout the process. First, the temperature was increased to the second temperature zone of 105℃ and dried for 36 min. Then, the temperature was increased to the third temperature zone of 108℃ and dried for 36 min. Then, the temperature was increased to the fourth temperature zone of 112℃ and dried for 36 min. Then, the temperature was increased to the fifth temperature zone of 118℃ and dried for 42 min. Then, the temperature was increased to the final temperature zone of 120℃ and dried for 30 min. After drying, the water-based wax sample was cooled to 25℃ in the vacuum drying oven to obtain the dried water-based wax sample and its mass was recorded.

[0073] Example 8

[0074] This embodiment provides a method for detecting the solid content of water-based waxes, the method comprising:

[0075] (1) Take 2 g of water-based wax sample and spread it evenly on a surface with an area of ​​7 cm². 2 In the vessel;

[0076] (2) The temperature of the preheated vacuum drying oven is 102℃ and the vacuum degree is 100 Pa. The water-based wax sample is placed in the vacuum drying oven and dried at 102℃ for 1 h.

[0077] (3) The temperature was increased at a rate of 1℃ / min throughout the process. First, the temperature was increased to the second temperature zone of 105℃ and dried for 36 min. Then, the temperature was increased to the third temperature zone of 108℃ and dried for 36 min. Then, the temperature was increased to the fourth temperature zone of 112℃ and dried for 36 min. Then, the temperature was increased to the fifth temperature zone of 118℃ and dried for 42 min. Then, the temperature was increased to the final temperature zone of 120℃ and dried for 30 min. After drying, the water-based wax sample was cooled to 25℃ in the vacuum drying oven to obtain the dried water-based wax sample and its mass was recorded.

[0078] Example 9

[0079] This embodiment provides a method for detecting the solid content of water-based waxes, the method comprising:

[0080] (1) Take 2 g of water-based wax sample and spread it evenly on a surface with an area of ​​7 cm². 2 In the vessel;

[0081] (2) The temperature of the preheated vacuum drying oven is 105℃ and the vacuum degree is 100 Pa. The water-based wax sample is placed in the vacuum drying oven and dried at 105℃ for 96 min.

[0082] (3) The temperature was increased at a rate of 1℃ / min throughout the process. First, the temperature was increased to the third temperature zone of 108℃ and dried for 36 min. Then, the temperature was increased to the fourth temperature zone of 112℃ and dried for 36 min. Then, the temperature was increased to the fifth temperature zone of 118℃ and dried for 42 min. Then, the temperature was increased to the final temperature zone of 120℃ and dried for 30 min. After drying, the water-based wax sample was cooled to 25℃ in the vacuum drying oven to obtain the dried water-based wax sample and its mass was recorded.

[0083] Example 10

[0084] This embodiment provides a method for detecting the solid content of water-based waxes, the method comprising:

[0085] (1) Take 2 g of water-based wax sample and spread it evenly on a surface with an area of ​​7 cm². 2 In the vessel;

[0086] (2) The temperature of the preheated vacuum drying oven is 100℃ and the vacuum degree is 100 Pa. Place the water-based wax sample in the vacuum drying oven and dry it at 100℃ for 1 h.

[0087] (3) The temperature was increased at a rate of 1℃ / min throughout the process. First, the temperature was increased to the second temperature zone of 105℃ and dried for 36 min. Then, the temperature was increased to the third temperature zone of 108℃ and dried for 36 min. Then, the temperature was increased to the fourth temperature zone of 112℃ and dried for 36 min. Then, the temperature was increased to the fifth temperature zone of 118℃ and dried for 72 min. After drying, the water-based wax sample was cooled to 25℃ in the vacuum drying oven to obtain the dried water-based wax sample and its mass was recorded.

[0088] Example 11

[0089] This embodiment provides a method for detecting the solid content of water-based waxes, the method comprising:

[0090] (1) Take 2 g of water-based wax sample and spread it evenly on a surface with an area of ​​7 cm². 2 In the vessel;

[0091] (2) The temperature of the preheated vacuum drying oven is 100℃ and the vacuum degree is 100 Pa. Place the water-based wax sample in the vacuum drying oven and dry it at 100℃ for 1 h.

[0092] (3) The temperature was increased at a rate of 1℃ / min throughout the process. First, the temperature was increased to the second temperature zone of 105℃ and dried for 36 min. Then, the temperature was increased to the third temperature zone of 108℃ and dried for 36 min. Then, the temperature was increased to the fourth temperature zone of 112℃ and dried for 36 min. Then, the temperature was increased to the fifth temperature zone of 118℃ and dried for 42 min. Then, the temperature was increased to the final temperature zone of 122℃ and dried for 30 min. After drying, the water-based wax sample was cooled to 25℃ in the vacuum drying oven to obtain the dried water-based wax sample and its mass was recorded.

[0093] Example 12

[0094] This embodiment provides a method for detecting the solid content of water-based waxes, the method comprising:

[0095] (1) Take 2 g of water-based wax sample and spread it evenly on a surface with an area of ​​7 cm². 2 In the vessel;

[0096] (2) The temperature of the preheated vacuum drying oven is 100℃ and the vacuum degree is 100 Pa. Place the water-based wax sample in the vacuum drying oven and dry it at 100℃ for 1 h.

[0097] (3) The temperature was increased at a rate of 1℃ / min throughout the process. First, the temperature was increased to the second temperature zone of 105℃ and dried for 36 min. Then, the temperature was increased to the third temperature zone of 108℃ and dried for 36 min. Then, the temperature was increased to the fourth temperature zone of 112℃ and dried for 36 min. Then, the temperature was increased to the final temperature zone of 115℃ and dried for 72 min. After drying, the water-based wax sample was cooled to 25℃ in the vacuum drying oven to obtain the dried water-based wax sample and its mass was recorded.

[0098] Example 13

[0099] This embodiment provides a method for detecting the solid content of water-based waxes, the method comprising:

[0100] (1) Take 2 g of water-based wax sample and spread it evenly on a surface with an area of ​​7 cm². 2 In the vessel;

[0101] (2) The temperature of the preheated vacuum drying oven is 100℃ and the vacuum degree is 100 Pa. Place the water-based wax sample in the vacuum drying oven and dry it at 100℃ for 20 min.

[0102] (3) The temperature was increased at a rate of 1℃ / min throughout the process. First, the temperature was increased to the second temperature zone of 105℃ and dried for 45 min. Then, the temperature was increased to the third temperature zone of 108℃ and dried for 45 min. Then, the temperature was increased to the fourth temperature zone of 112℃ and dried for 45 min. Then, the temperature was increased to the fifth temperature zone of 118℃ and dried for 50 min. Then, the temperature was increased to the final temperature zone of 120℃ and dried for 35 min. After drying, the water-based wax sample was cooled to 25℃ in the vacuum drying oven to obtain the dried water-based wax sample and its mass was recorded.

[0103] Example 14

[0104] This embodiment provides a method for detecting the solid content of water-based waxes, the method comprising:

[0105] (1) Take 2 g of water-based wax sample and spread it evenly on a surface with an area of ​​7 cm². 2 In the vessel;

[0106] (2) The temperature of the preheated vacuum drying oven is 100℃ and the vacuum degree is 100 Pa. The water-based wax sample is placed in the vacuum drying oven and dried at 100℃ for 2 h.

[0107] (3) The temperature was increased at a rate of 1℃ / min throughout the process. First, the temperature was increased to the second temperature zone of 105℃ and dried for 25 min. Then, the temperature was increased to the third temperature zone of 108℃ and dried for 25 min. Then, the temperature was increased to the fourth temperature zone of 112℃ and dried for 25 min. Then, the temperature was increased to the fifth temperature zone of 118℃ and dried for 30 min. Then, the temperature was increased to the final temperature zone of 120℃ and dried for 15 min. After drying, the water-based wax sample was cooled to 25℃ in the vacuum drying oven to obtain the dried water-based wax sample and its mass was recorded.

[0108] Comparative Example 1

[0109] This comparative example provides a method for detecting the solid content of water-based waxes, the method comprising:

[0110] (1) Take 2 g of water-based wax sample and spread it evenly on a surface with an area of ​​7 cm². 2 In the vessel;

[0111] (2) The temperature of the preheated vacuum drying oven is 100℃ and the vacuum degree is 100 Pa. The water-based wax sample is placed in the vacuum drying oven and dried at 100℃ for 260 min. After drying, the temperature of the vacuum drying oven is reduced to 25℃ to obtain the dried water-based wax sample and its mass is recorded.

[0112] Comparative Example 2

[0113] This comparative example provides a method for detecting the solid content of water-based waxes, the method comprising:

[0114] (1) Take 2 g of water-based wax sample and spread it evenly on a surface with an area of ​​7 cm². 2 In the vessel;

[0115] (2) The temperature of the preheated vacuum drying oven is 120℃ and the vacuum degree is 100 Pa. The water-based wax sample is placed in the vacuum drying oven and dried at 120℃ for 260 min. After drying, the temperature of the vacuum drying oven is reduced to 25℃ to obtain the dried water-based wax sample and its mass is recorded.

[0116] Comparative Example 3

[0117] This comparative example provides a method for detecting the solid content of water-based waxes, the method comprising:

[0118] (1) Take 2 g of water-based wax sample and spread it evenly on a surface with an area of ​​7 cm². 2 In the vessel;

[0119] (2) The temperature of the preheated vacuum drying oven is 110℃ and the vacuum degree is 100 Pa. The water-based wax sample is placed in the vacuum drying oven and dried at 110℃ for 260 min. After drying, the temperature of the vacuum drying oven is reduced to 25℃ to obtain the dried water-based wax sample and its mass is recorded.

[0120] Test Results

[0121] The solid content of the water-based waxes in Examples 1-14 and Comparative Examples 1-3 was calculated using the following formula:

[0122] Solid content (%) = (water-based wax sample after drying / water-based wax sample before drying) × 100%.

[0123] The test results are shown in Table 1 below:

[0124] Table 1

[0125]

[0126] The test results show that:

[0127] (1) As can be seen from Examples 1 to 14 and Comparative Examples 1 to 3, the present invention uses a gradient heating method to dry water-based wax samples. Compared with the traditional method of drying water-based wax at a single temperature, it can achieve a better separation effect of water and solvent, and the water-based wax solid content obtained by testing is more accurate.

[0128] (2) As can be seen from Examples 1 and 3-5, although a more accurate solid content can be obtained by further increasing the temperature range, the temperature control capability of the equipment is required to be high, the operation process is complicated, and it is not conducive to practical application. If no temperature range is set and the temperature is only raised to the final temperature for long-term drying, a wax film will still appear, which will affect the separation effect.

[0129] (3) As can be seen from Examples 1 and 6-14, the present invention affects the separation effect of water and solvent in water-based wax by adjusting the initial heating temperature, the final heating temperature, and the initial heating time. The lower the initial heating temperature, the shorter the initial heating time, and the lower the final heating temperature, the worse the separation effect of water and solvent. If the initial heating temperature is too high or the total heating time is fixed and the initial heating time is longer, it is easier to form a wax film. However, if the final heating temperature is further increased, it will no longer have a significant impact on the separation effect. Therefore, the present invention balances the equipment requirements, operation difficulty, and separation effect by adjusting the above parameters.

[0130] The applicant declares that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. A method for detecting the solid content of water-based waxes, characterized in that, The method for detecting the solid content of water-based wax includes drying the water-based wax sample using a gradient temperature increase, and then calculating the solid content of the water-based wax using the following formula: Solid content = (dried water-based wax sample / water-based wax sample before drying) × 100%.

2. The method for detecting the solid content of water-based wax according to claim 1, characterized in that, The drying is carried out under vacuum; Preferably, the vacuum degree is 100-150 Pa.

3. The method for detecting the solid content of water-based wax according to claim 1 or 2, characterized in that, The gradient heating includes n independent temperature intervals, where 2 ≤ n ≤ 24, and n is an integer; Preferably, the temperature difference between the temperature ranges is independently 1-24℃; Preferably, the heating rate between the temperature ranges is independently 0.1-2℃ / min; Preferably, n is 4-6, and the temperature difference between each temperature range is 2-6℃.

4. The method for detecting the solid content of water-based wax according to claim 3, characterized in that, The initial temperature range of the temperature range is 98-102℃; Preferably, the temperature of the final range of the temperature range is 118-122℃.

5. The method for detecting the solid content of water-based wax according to claim 3, characterized in that, The total drying time is 1-6 hours.

6. The method for detecting the solid content of water-based wax according to claim 3, characterized in that, The drying time of the water-based wax samples in each temperature range was 10-90 min independently.

7. The method for detecting the solid content of water-based wax according to claim 3, characterized in that, The drying time for the water-based wax sample in the initial range is 50-70 min.

8. The method for detecting the solid content of water-based waxes according to any one of claims 1-7, characterized in that, During the drying process, the water-based wax sample is placed in a container.

9. The method for detecting the solid content of water-based wax according to claim 8, characterized in that, The areal density of the aqueous wax sample in the vessel was 0.2-0.3 g / cm³. 2 .

10. The method for detecting the solid content of water-based waxes according to any one of claims 1-9, characterized in that, The drying process is carried out in a sealed heating device; Preferably, the sealing heating device is preheated; Preferably, the temperature of the sealed heating device after preheating is 98-102℃; Preferably, after the drying process is completed, the water-based wax sample is cooled to 20-30°C under vacuum conditions in a sealed heating device.

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