A method and device for measuring the amount of resin

Abstract

The present invention discloses a method for measuring the amount of resin, which includes: (1) determining the maximum water absorption rate Xmax and volume ratio T of the control resin sample; (2) measuring the resin sample with a dry mass of m: taking the resin sample ma and placing it in the measuring device, adding water to submerge it so that the resin fully absorbs water, then draining the water, weighing the resin mass mb, and calculating the water absorption rate X; determining the rough weighing M according to M = m(1 + Xmax) / (1 + X); supplementing the resin sample according to M - ma, adding water to submerge it so that the resin fully absorbs water, and then draining the water; adding water with a volume of V to submerge it, and then supplementing or removing resin until the volume reading is equal to m×T + V, and draining the water, that is, measuring the resin sample with a dry mass of m. Compared with the prior art, the method of the present invention eliminates the influence of the water content of the resin on the weighing result, and there is no need to dry the resin during each measurement, improving the measurement efficiency and accuracy of the resin.

Description

Technical Field

[0001] The present invention relates to a method and device for measuring the amount of resin. Background Art

[0002] Resin is a commonly used adsorbent material for extracorporeal perfusion. Mass and volume are two ways to measure resin. Due to differences in the materials, processing techniques, and storage environments used by different manufacturers, the water content of resin varies greatly. For the same mass of resin measured by a balance, due to the large difference in water content between the upper and lower layers, there is often a discrepancy between the actual value and the measured value. For resins with a large difference in water content, directly weighing with a balance is unreliable.

[0003] To measure accurately, the water displacement method is commonly used in experiments to measure the volume of a small amount of resin. Usually, a small amount of resin is weighed with a balance and placed in a graduated cylinder, and water is added to the graduated cylinder to submerge it, or water is measured with a graduated cylinder and poured into other containers, and then the water is poured out to calculate the volume difference. Then, the mass of the required volume is calculated using the ratio of mass to volume difference, and finally, it is weighed with a balance. It is often calculated based on a few grams of resin, the process is complex, the calculation process cannot spill out, cannot have too much residue, and the error is large. It is required that the water content during weighing is basically the same as the material used in the calculation, the ratio of mass to volume does not represent the water content, and it is difficult to judge with the naked eye the degree of difference between the material used in the calculation and the weighed material.

[0004] Actually, the volume obtained by using the water displacement method is not the volume of the resin. Due to the adsorption of the resin, most of the water is adsorbed on the surface of the resin and will not flow out. Therefore, using the water displacement method to measure a certain amount of resin not only has a systematic error, but also requires the material's water adsorption ability to remain unchanged. In the actual environment, resins are often stored in nylon bags or simple sealed bags. Even for the same model and the same bag of resin, the water content difference between the upper and lower layers is large, and using a higher standard storage method for resins is not economically viable.

[0005] The wet weighing method can avoid weighing errors caused by material water content differences. Using a completely non-water-absorbing material as a control, each time when weighing, the resin is submerged to make it fully absorb water, and then the excess water is drained and weighed. Therefore, only the gaps between resins need to be considered. However, affected by the senses of the weighing personnel, the degree of water drainage of the resin during each weighing has a great impact on the weighing result. It is required that the submerged material is greater than the required material, resulting in waste of resin materials and even contamination of the materials, posing a huge hidden danger to product safety. And due to the difference in water content of the resin material, the error obtained by submerging the resin in water for weighing using the water displacement method and then subtracting the mass of water is also affected by the material itself. Drying the material each time to make it water-free before weighing can also avoid the influence of water content, but the drying time is long and the power cost consumed is even greater than the resin itself, and complete drying will damage the function of the resin itself.

[0006] Resin materials have uneven moisture content. Weighing by mass cannot eliminate the weighing error caused by this inconsistent moisture content. Volumetric weighing is the standard for accurate weighing. Because resin absorbs moisture, the water difference method is affected by the resin's water absorption capacity. If the resin absorbs less water, the water difference method will overestimate the weighing value. A high water absorption rate will result in a lower weighing result. Drying the resin can irreversibly damage its properties. Summary of the Invention

[0007] In order to overcome the above-mentioned deficiencies in the prior art when weighing resin, the present invention provides an improved resin measuring method, which can accurately measure the required resin while avoiding irreversible damage to the resin function.

[0008] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0009] A method for measuring a resin, comprising:

[0010] (1) Determine the maximum water absorption rate X of the control resin sample max And volume ratio T:

[0011] Take an absolutely dry control resin sample m0 and place it in a measuring device with a volume scale. Add water to immerse it so that the resin can fully absorb water. Then drain the water and weigh the resin mass m1. Add water to immerse it again, read the volume V2, and weigh the total mass of water and resin m2.

[0012] X max =(m1-m0) / m0×100%,

[0013] T=[V2-(m2-m1)] / m0;

[0014] (2) The amount of resin sample with an absolute dry mass of m is:

[0015] (2-1) Determine the water absorption rate X of the resin sample: Take the resin sample m a Place it in a measuring device, add water to immerse it so that the resin can fully absorb water, then drain the water and measure the resin mass m b Weighing,

[0016] X=(m b -m a ) / m a ×100%;

[0017] (2-2) Determine the crude weight M of the resin sample: M = m(1 + X max ) / (1+X);

[0018] (2-3) Press Mm a Add the resin sample to the measuring device of step (2-1), add water to immerse the resin so that the resin can fully absorb water, and then drain the water;

[0019] (2 - 4) Determine the standard volume: Add water with a volume of V to the measuring device in step (2 - 3) to submerge it. Standard volume = m×T + V;

[0020] (2 - 5) After adding or removing resin to the measuring device in step (2 - 4) until the volume reading is equal to the standard volume, drain the water, and thus measure a resin sample with an absolutely dry mass of m.

[0021] Preferably, in step (2 - 5), the added resin is pre - wetted.

[0022] A measuring device for resin, comprising: a measuring chamber with volume graduations, a filter screen located at the bottom of the measuring chamber, and a drain outlet that can be closed and opened.

[0023] Preferably, the mesh number of the filter screen is 80 mesh.

[0024] Preferably, the material of the measuring chamber is transparent glass or transparent plastic.

[0025] Preferably, the measuring chamber is cylindrical.

[0026] Beneficial effects

[0027] Compared with the prior art, the method of the present invention eliminates the errors caused by different and uneven water contents of the resin on the resin weighing result, and there is no need to dry the resin, which causes irreversible damage each time the resin is measured, improving the measuring efficiency and accuracy of the resin. Description of the drawings

[0028] Figure 1 is the front view schematic diagram of the measuring device for resin of the present invention;

[0029] Figure 2 is the left - view schematic diagram of the measuring device for resin of the present invention;

[0030] Figure 3 The top - view schematic diagram of the measuring device for resin of the present invention;

[0031] Among them, 1 - measuring chamber, 2 - drain outlet, 3 - rubber stopper, 4 - filter screen, 11 - volume graduations. Detailed implementation manners

[0032] The following further details the present invention in conjunction with the drawings and embodiments.

[0033] The structural schematic diagram of the measuring device of the present invention is as Figures 1 - 3As shown in the figure, the measuring device includes a measuring chamber. Volume scales indicating volume are engraved on the wall of the measuring chamber, and the specific scales are calibrated according to the size of the measuring chamber. A drain outlet is provided at the bottom end of the measuring chamber, and its opening or closing state can be controlled by a rubber stopper, a valve stopper, etc. A filter screen is laid at the bottom end of the measuring chamber, and a filter screen with a mesh number of 80 can be selected.

[0034] The measuring chamber is made of transparent glass or transparent plastic.

[0035] The measuring chamber is cylindrical.

[0036] The volume unit of the present invention is ml, the mass unit is g, and the density of water is 1 g / ml.

[0037] The method for measuring resin of the present invention includes the following steps:

[0038] One: Weighing preparation and selecting a standard control

[0039] 1. Select a control material: Select a completely dry resin material as the quality standard control, and convert the mass of resins with different water contents of the same model weighed later into the mass in the completely dry state.

[0040] Weigh an appropriate amount of resin and dry it in an oven, weigh it every 3 hours, and if the mass does not change after three consecutive weighings, it is resin with a water content of 0 (absolutely dry). Take m0 grams (10 g) and place it in the measuring chamber of the measuring device. Add an appropriate amount of water to submerge it and let it fully absorb water. Then open the drain outlet, drain it completely, and weigh the mass of the resin m1 (25 g). Close the drain outlet, add an appropriate amount of water to submerge it, and read the volume reading V2 (74 ml). At this time, the total mass of water and resin is m2 (75 g).

[0041] 2. Calculate the maximum water absorption rate: The maximum water absorption rate X of this type of resin max =(m1 - m0) / m0×100%

[0042] X max =(25 - 10) / 10×100% = 150%

[0043] 3. Calculate the volume ratio: T = [V2 - (m2 - m1)] / m0×100%

[0044] T = [74 - (75 - 25)] / 10×100% = 240%

[0045] When measuring the same type of resin each time, the above steps do not need to be repeated. After the resin type is changed, only the X max and T of this type of resin need to be re-measured.

[0046] Two: Quickly and accurately weigh resin with an absolutely dry mass of m (taking m = 20 g as an example):

[0047] 1. Calculate the water absorption rate X of the resin: Place the resin measuring device on the balance to tare, add an appropriate amount of resin m a g (10 g) into the measuring chamber of the measuring device, close the drain port, add an appropriate amount of water to submerge it, shake to make it fully absorb water and precipitate, open the drain port to drain all the water, and weigh the mass of the resin m b g (14 g) at this time. Then

[0048] X = (m b - m a ) / m a × 100%,

[0049] X = (14 - 10) / 10 × 100% = 40%.

[0050] 2. Calculate the approximately weighed resin mass M according to the formula: M = m(1 + X max ) / (1 + X),

[0051] M = 20 × (1 + 1.5) / (1 + 0.4) ≈ 35.7 g. Then add the resin M - m a g (3.57 - 10 = 25.7 g) to the measuring chamber, add an appropriate amount of water to submerge it, and drain the water after the resin fully absorbs water.

[0052] 3. Calculate the standard volume: Close the drain port, add sufficient water V ml (50 ml) to submerge the resin. The standard volume should be m × T + V (20 × 2.40 + 50 = 98 ml).

[0053] 4. Fine-tune the amount of resin, use a clean spoon to add or remove resin from the measuring chamber until the volume scale reading is equal to the standard volume. The added resin can be pre-moistened.

[0054] 5. Open the drain port to drain the water, and thus weigh the resin with a dry mass of m g (20 g). The average error of three repetitions is 0.67%, while the weighing error of the existing technology reaches 2% - 10%.

[0055] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for measuring the amount of resin, comprising: (1) Determine the maximum water absorption X of the control resin sample max and the volume ratio T: Taking a dry reference resin sample m0 and placing it in a measuring device with volume graduations. Add water to submerge the resin to allow it to fully absorb water, then drain the water and weigh the resin mass m1. Submerge it again with water, read the volume V2, and weigh the total mass m2 of the water and the resin. X max =(m1 - m0) / m0 × 100%, T = [V2 - (m2 - m1)] / m0; (2) Measuring a resin sample with a dry mass of m: (2-1) Determine the water absorption rate X of the resin sample: Take the resin sample m a Place it in the measuring device, add water to submerge it so that the resin absorbs water fully, then drain the water, and weigh the mass m of the resin b for weighing X = (m b - m a ) / m a × 100%; (2-2) Determine the rough weighing M of the resin sample: M = m(1 + X max ) / (1 + X); (2 - 3) Press M - m a Supplement the resin sample to the measuring device in step (2 - 1). After adding water to submerge the resin to allow it to fully absorb water, drain the water completely; (2-4) Determining the standard volume: Add water with a volume of V to the measuring device in step (2-3) to submerge it. The standard volume = m × T + V; (2-5) After adding or removing resin to the measuring device in step (2-4) until the volume reading is equal to the standard volume, drain the water, and thus measure a resin sample with a dry mass of m.

2. The method for measuring the amount of the resin according to claim 1, characterized in that: In step (2-5), the added resin is pre-wetted.

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