CN102147355B - Device and method for measuring water absorption rate of drought-resistant compound fertilizer - Google Patents

Abstract

The invention relates to a determination device for measuring the water absorption of a drought resisting compound fertilizer and water-retaining agent and a method. The device comprises an iron support stand, a tapered hopper, an alkali buret, a transparent rubber hose and an acid buret. The determination method comprises the following steps: adding distilled water from the opening of the hopper, opening a piston under the acid buret and adjusting the height of the liquid level so as to lead the zero-scale liquid level in the acid buret to be level with the liquid level at the bottom of the tapered hopper; then pouring a weighted drought resisting compound fertilizer into the bottom of the tapered hopper, lifting the acid buret by about 20 to 30cm, adjusting the height of the acid buret after totally moistening the drought resisting compound fertilizer in the hopper so as to lead the liquid level of the acid buret to be maintained at the bottom of the tapered hopper, closing the piston of the acid buret and recording the scale of the acid buret. The determination device is used for determining the water absorption of the drought resisting compound fertilizer; and the determination device is simple and reliable and can dynamically determine the variation of the water absorption of the drought resisting compound fertilizer.

Description

Device and method for measuring water absorption rate of drought-resistant compound fertilizer

technical field

The invention relates to a water absorption measuring device and a method thereof, in particular to a device and a method for measuring the water absorption of a drought-resistant compound fertilizer and a water-retaining agent.

Background technique

Polymer water retaining agent is a new type of functional polymer material with particularly strong water absorption capacity. It has been widely used in sanitary products, agriculture and gardening, medicine and construction. The water absorption rate of polymer water retaining agent directly affects its application in sanitary products, so the evaluation of water absorption performance is particularly important. The synthesis and preparation of water-retaining agents have been highly valued, and there are as many as 85 authorized invention patents. However, there is no systematic research on the determination of water-absorbing rate of water-retaining agents.

Drought-resistant compound fertilizers are generally wrapped on the surface of fertilizer particles by a polymer water-retaining agent. The polymer water-retaining agent can retain water and fertilizer, but the water absorption rate of the water-retaining agent has a great relationship with the concentration of inorganic salts. When dissolved to form ions, the water retention function of the water retaining agent is significantly reduced. The water absorption process of the drought-resistant compound fertilizer water absorption is a dynamic process, so the ordinary mesh bag filtration method and other methods cannot obtain correct results when measuring the water absorption rate of the drought-resistant compound fertilizer.

The current methods for measuring water absorption of polymer water-absorbent resins mainly include natural filtration method (mesh bag method), flow method, centrifugal separation method, paper bag method, sheet method, graduated cylinder method and capillary method. The natural filtration method (mesh bag method) is mainly to put the water-retaining agent into a large amount of water, and after it swells to absorb water, filter the remaining water with a sieve. Generally, 200-mesh sieves are used to filter out water, and the weight of the water-retaining agent increases after absorbing water to determine the water-absorbing capacity of the water-retaining agent. This method is relatively simple. In actual operation, it is found that the mesh bag method is also prone to errors during the measurement process. The main reason is that the water-retaining agent needs a certain amount of time to absorb water, and the change of water-absorbing performance of the water-retaining agent cannot be dynamically observed. Secondly, the net bag method cannot be used to determine the water absorption multiple of drought-resistant compound fertilizer, mainly because the nutrient ions in the fertilizer are lost from the net bag with water, so the weight of water absorption cannot be determined.

The capillary method is that the water-retaining agent absorbs water by capillary suction to observe the change of water volume in the capillary. The defect of this measurement method is that the diameter of the capillary is small, and the mesh in the Buchner funnel is generally 200 mesh. The part of the water-retaining agent that has absorbed water is easy to block the capillary pores and form partly wet. This measurement of moisture will also cause a large error.

Contents of the invention

The purpose of the present invention is designed for the above-mentioned device and method deficiency of the natural filtration method (mesh bag method), to provide a device and method for measuring the water absorption rate of drought-resistant compound fertilizers, and to solve the problem that existing measuring devices cannot accurately measure the water absorption rate of drought-resistant compound fertilizers The method is not a device for dynamically measuring the water absorption rate of the water-retaining agent in the drought-resistant compound fertilizer.

In order to solve the problems of the technologies described above, the present invention adopts the following technical solutions:

A device for measuring the water absorption rate of drought-resistant compound fertilizers, comprising an iron stand, an alkali burette, and an acid burette, characterized in that: the acid burette and the alkali burette are respectively fixed on both sides of the iron stand, and the acid burette and the alkali The basic burettes are connected together by a transparent rubber hose, and a tapered funnel is arranged on the basic burettes.

The measuring device is characterized in that: the acid burette and the alkali burette are fixed on the iron stand in a manner perpendicular to the ground, and the acid burette and the alkali burette are located on the same plane.

The measuring device is characterized in that: the handle of the tapered funnel is inserted into the alkaline burette, and the handle of the tapered funnel is covered with a soft rubber tube to fit the inner wall of the upper port of the alkaline burette. The soft rubber tubes are sealed with petroleum jelly.

The measuring device is characterized in that: both the capacity of the acid burette and the alkaline burette are 50 milliliters.

The method for measuring the water absorption rate of a compound fertilizer by the measuring device is characterized in that it comprises the following steps:

(1) Prepare the iron stand, acid burette, alkaline burette, conical funnel, transparent rubber hose, soft rubber tube, filter paper, petroleum jelly, drought-resistant compound fertilizer, water-retaining agent and distilled water;

(2) Fix the acid burette and basic burette on the iron stand, and the top of the acid burette is slightly higher than the top of the basic burette, insert the tapered funnel into the basic burette, and use a soft rubber tube for the handle of the tapered funnel Put it on, apply a little Vaseline on the soft rubber tube to achieve the sealing effect, fold the filter paper into a cone shape and stick to the inside of the funnel;

(3) Add distilled water from the funnel, and adjust the height of the liquid level so that the liquid level at 0 scale in the acid buret is equal to the liquid level at the bottom of the conical funnel;

(4) Weigh the drought-resistant compound fertilizer with a ten-thousandth balance, and pour the drought-resistant compound fertilizer into the bottom of the conical funnel;

(5) Raise the acid burette by about 20-30 cm;

(6) After the drought-resistant compound fertilizer in the liquid surface is completely wetted, adjust the height of the acid burette so that the liquid level of the alkaline burette remains at the bottom of the conical funnel, close the piston of the acid burette, record the scale of the acid burette, and pass The measured water absorption of the drought-resistant compound fertilizer can determine the water absorption of the water-retaining agent.

The measuring device used is simple and easy to assemble, and can be assembled in an ordinary laboratory. The biggest advantage is that it can dynamically observe the changes in the water absorption rate of the drought-resistant compound fertilizer and water-retaining agent. For the compound fertilizer wrapped in polymer water-retaining agent, its water absorption performance has a great influence on the salt in the compound fertilizer. For example, when the salt concentration is 0.1%, Its water absorption performance is obviously reduced. The said device can dynamically observe the change of the water absorption of the drought-resistant compound fertilizer, and when the salt overflows or dissolves, the volume of the water absorption will become smaller.

Description of drawings

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Figure 1 is a schematic diagram of a device for measuring the water absorption rate of a drought-resistant compound fertilizer.

Detailed ways

As shown in Figure 1, the acid burette 3 and the alkali burette 2 are fixed on the iron stand 4 in a manner perpendicular to the ground, and the acid burette 3 and the alkali burette 2 are located on the same plane; Connect the alkaline burette 2, the transparent rubber hose 6, and the acid burette 3; a thin layer of filter paper is placed in the tapered funnel 1, and the alkaline burette 2 and the tapered funnel 1 are covered with a rubber tube. Apply a little vaseline to the outside of the soft rubber tube to achieve a sealing effect.

The method for measuring water absorption by the measuring device is characterized in that the measuring method comprises the following steps:

(1) Prepare the iron stand 4, acid burette 3, alkali burette 2, conical funnel 1, transparent rubber hose 6, soft rubber tube, filter paper, vaseline, drought-resistant compound fertilizer, water retention agent and distilled water;

(2) Fix the acid burette 3 and the basic burette 2 on the iron stand 4, and the top of the acid burette 3 is slightly higher than the top of the basic burette 2 . Insert the conical funnel 1 into the alkaline burette 2, fold the filter paper into a conical shape and close to the inside of the funnel, cover the handle of the conical funnel with a soft rubber tube, and apply a little Vaseline on the soft rubber tube to achieve a sealing effect. the

(3) Add distilled water from the funnel, and adjust the height of the liquid level so that the liquid level at 0 scale in the acid buret is equal to the liquid level at the bottom of the conical funnel;

(4) Weigh the drought-resistant compound fertilizer with a ten-thousandth balance, and pour the drought-resistant compound fertilizer into the bottom of the conical funnel;

(5) Raise the acid burette 3 by 20-30 cm;

(6) After the drought-resistant compound fertilizer in the liquid surface is completely wetted, adjust the height 3 of the acid burette so that the liquid level of the alkaline burette 2 remains at the bottom of the conical funnel 1, close the piston 5 of the acid burette, and record the acid burette 3 scale.

The water absorption rate of the water retaining agent can also be determined by the above method. the

Claims (4)

1. A measuring device for measuring the water absorption rate of drought-resistant compound fertilizers, comprising an iron stand, an alkali burette, an acid burette, is characterized in that: an acid burette and an alkali burette are respectively fixed on both sides of the iron stand, and the acid burette The burette and the basic burette are connected together through a transparent rubber hose, and a tapered funnel is arranged on the basic burette, and the handle of the tapered funnel is inserted into the basic burette, and the handle of the tapered funnel is covered with A soft rubber tube is attached to the inner wall of the upper port of the alkaline burette, and the soft rubber tube is sealed with Vaseline. 2. measuring device according to claim 1, is characterized in that: described acidic burette and basic burette are fixed on the iron frame platform in the mode perpendicular to ground, and described acidic burette and basic burette are positioned at same plane . 3. The measuring device according to claim 1, characterized in that: the capacity of the acidic burette and the alkaline burette is 50 milliliters. 4. a method utilizing the assay device claimed in claim 1 to measure the water absorption of compound fertilizer, is characterized in that, comprises the following steps: (1) Prepare the iron stand, acid burette, alkaline burette, tapered funnel, transparent rubber hose, soft rubber tube, filter paper, petroleum jelly, drought-resistant compound fertilizer, water retention agent and distilled water; (2) Fix the acid-type burette and the base-type burette on the iron stand, and the top of the acid-type burette is slightly higher than the top of the base-type burette, insert the conical funnel into the basic burette, and use a soft rubber tube for the handle of the conical funnel Put it on, apply a little Vaseline on the soft rubber tube to achieve the sealing effect, fold the filter paper into a cone shape and stick to the inside of the funnel; (3) Distilled water is added from the funnel, and the height of the liquid level is adjusted so that the 0-scale liquid level in the acid buret is equal to the liquid level at the bottom of the conical funnel; (4) Weigh the drought-resistant compound fertilizer with a ten-thousandth balance, and pour the drought-resistant compound fertilizer into the bottom of the conical funnel; (5) Raise the acid burette by about 20-30 cm; (6) After the drought-resistant compound fertilizer in the liquid surface is completely wetted, adjust the height of the acid burette so that the liquid level of the alkaline burette remains at the bottom of the conical funnel, close the piston of the acid burette, record the scale of the acid burette, and pass The measured water absorption of the drought-resistant compound fertilizer can determine the water absorption of the water-retaining agent.

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