Method for testing foam performance of wash care product

Abstract

The invention discloses a method for testing foam performance of a wash care product, which comprises the following specific implementation processes: preparing cellulose paper, drawing 2-4 circles of concentric circles on the surface of the cellulose paper, arranging foam limiting rings at the centers of the concentric circles, enabling the centers of the foam limiting rings to coincide with the centers of the concentric circles, and generating foam by using a packaging bottle of an actual product. Foam is squeezed into the foam limiting ring, the time required for soaking the foam from the center to the edge of each concentric circle is observed and recorded, time data corresponding to different diffusion radiuses are obtained, and the foam diffusion speed is evaluated. According to the method, expensive equipment is not needed, testing can be carried out only through simple cellulose paper and a foam pump bottle, and the cost is low.

Description

Technical Field

[0001] The invention belongs to the technical field of foam testing, and in particular relates to a method for testing the foam performance of a washing product. Background Art

[0002] Existing foam testing methods mainly include the Roche foam method and the dynamic foam analyzer method. Although the Roche foam method is simple, the foaming principle is that the liquid impacts the liquid surface under the action of gravity to generate foam, which cannot effectively simulate the foaming behavior of the product when it is actually used. The dynamic foam analyzer method is a traditional stirring method to stimulate foam. Although it can provide accurate dynamic data on foam generation and dissipation, the equipment is expensive and the operation is complicated. In addition, the experimental conditions are different from the daily use environment, and it cannot fully reflect the foam performance of the product in actual use.

[0003] In actual applications, many cleaning products generate foam through specific foam bottles. Therefore, when testing foam stability, it is best to simulate the actual use of the product, so as to obtain foam stability data with actual reference value. The prior art lacks a testing method for foam stability that is both economical and effective and can intuitively and accurately simulate the actual use of the product.

[0004] The stability of the foam system mainly involves: 1) Under the combined action of gravity (or external pressure difference force), capillary force and viscosity force, the trace liquid in the foam flows in the channel formed by the Platonic channel and the intersection, so that the bubbles and liquid are separated, which is called foam drainage; 2) The diffusion of molecules from the small bubbles with high pressure inside to the adjacent large bubbles with low pressure through the liquid film causes the merging of bubbles, which is called bubble coarsening; 3) The rupture of the liquid film between bubbles causes the merging of adjacent bubbles, which is called liquid film rupture. Foam drainage is a dominant mechanism for the stability of the foam system. The drainage process occurs before the foam breaks. The drainage rate is a standard for measuring the stability of the foam and is also one of the most concerned phenomena in the industrial production process. Summary of the invention

[0005] In view of the above problems, the object of the present invention is to provide a method for testing the foam performance of washing products.

[0006] The specific technical solutions are as follows:

[0007] A method for testing the foam performance of a cleaning product comprises the following steps:

[0008] 1) Prepare cellulose paper and draw 2-4 concentric circles on the surface of the paper, set a foam limiting circle at the center of the concentric circles, and the center of the foam limiting circle coincides with the center of the concentric circles;

[0009] 2) Use the actual product packaging bottle to generate foam and squeeze the foam into the foam limiting circle;

[0010] 3) Observe and record the time required for the foam to penetrate from the center to the edge of each concentric circle, and obtain the time data corresponding to different diffusion radii. When the time difference of the foam penetrating the edges of adjacent concentric circles is greater than 10 seconds, stop the experiment and record the foam penetration time.

[0011] Furthermore, the radius of each concentric circle in step 1) is the same, 1-5 cm, to facilitate the detailed recording of the diffusion of the foam, and the diameter of the smallest circle is 2-4 cm to ensure that the foam can be stably distributed in the test area to facilitate subsequent measurements.

[0012] Furthermore, the foam limiting circle is an annular cylinder made of transparent PC material, with an inner diameter of 20-80mm, a wall thickness of less than 1.5mm, and a height of 20-50mm, to ensure that the foam can be maintained in the specified area during generation, which is convenient for measuring the diffusion time and stability. The outer wall of the foam limiting circle is provided with a scale line of 0-50mm and a graduation value of 1mm. The foam stability of different products varies greatly. Therefore, according to the experimental situation, if the foam of the product is more stable, a circle with a larger inner diameter is used, and if the foam is unstable, a circle with a smaller inner diameter is used.

[0013] Furthermore, the pore size of the cellulose paper ranges from 1 to 150 μm, and the water absorption is 50 to 500 ml / m 2 , ensuring that the foam can fully absorb the liquid when it spreads, but not absorbing water too quickly, which will affect the diffusion performance of the foam.

[0014] The beneficial effects of the present invention are:

[0015] 1) Economical and effective: This method does not require expensive equipment, and only requires simple cellulose paper and a foam pump bottle for testing, which is low cost.

[0016] 2) Easy operation: The test steps are simple and easy to perform, and do not require complicated operations or professional skills.

[0017] 3) Simulate actual usage: By using the product’s own packaging equipment to generate foam, the test results are more valuable for reference and can better simulate the foam behavior of the product in daily use.

[0018] 4) Intuitive results: The foam diffusion rate and its stability can be directly judged through visual observation and time recording, and the evaluation process is intuitive and clear. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with embodiments, but the protection scope of the present invention is not limited thereto.

[0020] Embodiment 1:

[0021] Foam stability test of several shampoo samples

[0022] Prepare a 20 cm × 20 cm cellulose paper (water absorption 200 ml / m 2 ), and draw concentric circles with radii of 5cm, 6cm, 7cm, and 8cm on it. Use the same foam pump bottle to squeeze out the same number of pumps of foam and place it in the central foam fixing circle (the foam fixing circle has an inner diameter of 40mm, a wall thickness of 1mm, a height of 40mm, and is marked with a 30mm scale line with a graduation of 1mm) and start timing, recording the time it takes for the foam to spread to each concentric circle. Through data analysis, the stability of the shampoo foam is judged, and the test results are shown in Table 1.

[0023] Table 1 Foam stability test results of different shampoo samples

[0024]

[0025] The data show that this method is tested with The test results of DFA100 foam analyzer have basically the same trend.

[0026] Embodiment 2:

[0027] 0.5% cocamidopropyl betaine, 0.5% alkyl glucoside, and 0.5% sodium methyl cocoyl taurate solutions were prepared for testing.

[0028] Prepare a 20 cm × 20 cm cellulose paper (water absorption 200 ml / m 2 ), and draw concentric circles with radii of 4cm, 5cm, 6cm, and 7cm on it. Use the same foam pump bottle to squeeze out the same number of pumps of foam and place it in the central foam fixing circle (the foam fixing circle has an inner diameter of 30mm, a wall thickness of 1mm, a height of 30mm, and is marked with a 20mm scale line with a graduation of 1mm) and start timing, recording the time it takes for the foam to spread to each concentric circle. Through data analysis, the stability of the sample foam is determined, and the test results are shown in Table 2.

[0029] Table 2 Foam stability test results of the solution of Example 2

[0030]

[0031] From the above table, we can see that the test data of 0.5% cocamidopropyl betaine and 0.5% sodium methyl cocoyl taurate solutions are consistent with the test data of the foam meter, and the result of 0.5% alkyl polyglycoside is very different from the test result of the foam meter. This is because the foam pump cannot shear out a large amount of foam from 0.5% alkyl polyglycoside. In fact, 0.5% alkyl polyglycoside is squeezed out of a large amount of liquid and a small amount of foam in the foam pump. Therefore, in this case, this method is closer to the actual use experience than the foam meter.

Claims

1. A method for testing the foam performance of a cleaning product, characterized in that: The steps include: 1) Prepare cellulose paper and draw 2-4 concentric circles on the surface of the paper, set a foam limiting circle at the center of the concentric circles, and the center of the foam limiting circle coincides with the center of the concentric circles; 2) Use the actual product packaging bottle to generate foam and squeeze the foam into the foam limiting circle; 3) Observe and record the time required for the foam to penetrate from the center to the edge of each concentric circle, and obtain the time data corresponding to different diffusion radii. When the time difference of the foam penetrating the edges of adjacent concentric circles is greater than 10 seconds, stop the experiment and record the foam penetration time.

2. A method for testing the foam performance of a cleaning product as claimed in claim 1, characterized in that: In step 1), the radius of each concentric circle is the same, 1-5 cm, and the diameter of the smallest circle is 2-4 cm.

3. A method for testing the foam performance of a cleaning product as claimed in claim 1, characterized in that: The foam limiting ring is an annular cylinder made of transparent PC material, with an inner diameter of 20-80mm, a wall thickness of less than 1.5mm, and a height of 20-50mm. The outer wall of the foam limiting ring is provided with a scale line of 0-50mm and a graduation value of 1mm.

4. A method for testing the foam performance of a cleaning product as claimed in claim 1, characterized in that: The pore size of cellulose paper ranges from 1 to 150 μm, and the water absorption is 50 to 500 ml / m 2 .

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