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Drinking water slow-release disinfection tablets and preparation method

A technology of disinfecting tablets and aqueous solutions, applied in the directions of botanical equipment and methods, disinfectants, chemicals for biological control, etc., can solve the problems of changing raw water, short time, restricting production, etc., and achieve cost reduction and simple process. Effect

Active Publication Date: 2013-04-03
INST OF HYGIENE & ENVIRONMENTAL MEDICINE PLA ACAD OF MILITARY MEDICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of the currently commonly used slow-release disinfectants are: 1. The slow release time in water is relatively short, generally only 4-13 days. For disinfection that requires long-term water storage, it is necessary to increase the number of doses; 2. Slow release The disinfectant will change the pH of the raw water, which is not suitable for drinking; 3. It is not possible to use a general tablet press during preparation, but a high-pressure tablet press, such as a 40-ton press, is required, which is costly and limits production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A kind of preparation of drinking water sustained-release disinfection tablet:

[0020] Mix 50g of dichlorohydantoin and 1.5g of magnesium stearate powder evenly, add 15ml of 3g / 100ml polyvinyl alcohol aqueous solution, mix well, sieve with a 20-mesh sieve to make granules, and bake at 70°C Dry, add appropriate amount of talcum powder, press with ordinary tablet machine, the drinking water sustained-release disinfection tablet made, the average tablet weight is 1 gram.

[0021] Add 2L of distilled water into the Erlenmeyer flask, put 1 slow-release disinfection tablet for drinking water of the present embodiment, change the water at a fixed time every day, and measure the available chlorine content. It was determined that the available chlorine content on the 51st and 52nd days decreased to 0.29 mg / L and 0.27 mg / L. Before that, the available chlorine content had been higher than the limit value of 0.3 mg / L for the residual chlorine content stipulated by the national dri...

Embodiment 2

[0023] A kind of preparation of drinking water sustained-release disinfection tablet:

[0024] Mix 50 grams of dichlorohydantoin and 15 g of magnesium stearate evenly, add 15 ml of 30 g / 100 ml polyvinyl alcohol aqueous solution, mix well, sieve with a 5-mesh sieve, make granules, and dry at 70 ° C. Add an appropriate amount of talcum powder, and use an ordinary tablet press to compress the tablet to form a sustained-release disinfection tablet for drinking water, with an average tablet weight of 1 gram.

[0025] Add 2L of distilled water in the Erlenmeyer flask, put 1 slow-release disinfection tablet for drinking water of the present embodiment, change the water at a fixed time every day, and measure the effective chlorine content. It was determined that the available chlorine content on the 51st and 52nd days decreased to 0.29 mg / L and 0.28 mg / L. Before that, the available chlorine content had been higher than the limit value of 0.3 mg / L for residual chlorine stipulated by th...

Embodiment 3

[0027] A kind of preparation of drinking water sustained-release disinfection tablet:

[0028] Mix 50 grams of dichlorohydantoin and 30 g of magnesium stearate evenly, add 15 ml of 15 g / 100 ml polyvinyl alcohol aqueous solution, mix well, sieve with a 20-mesh sieve, make granules, and dry at 70 ° C. Add an appropriate amount of talcum powder, and use an ordinary tablet press to compress the tablet to form a sustained-release disinfection tablet for drinking water, with an average tablet weight of 1 gram.

[0029] Add 2L of distilled water in the Erlenmeyer flask, put 1 slow-release disinfection tablet for drinking water of the present embodiment, change the water at a fixed time every day, and measure the effective chlorine content. It was determined that the available chlorine content on the 51st and 52nd days decreased to 0.28 mg / L and 0.27 mg / L, and the available chlorine content has been higher than the national drinking water standard. , The slow-release period of drinki...

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Abstract

The invention discloses drinking water slow-release disinfection tablets and a preparation method. The preparation method comprises the following steps of: uniformly mixing dichloro-dimethyl hydantoin and magnesium stearate powder, adding aqueous solution of polyvinyl alcohol, fully mixing, sieving to form particles, and drying and tabletting to obtain the drinking water slow-release disinfectiontablets. The slow release time of the drinking water slow-release disinfection tablets in water reaches more than 50 days by using a nontoxic high molecular compound, namely the polyvinyl alcohol as a bonding agent; and the pH of raw water cannot be changed. A high-pressure tablet machine is avoided during preparation and tabletting is performed by using a common tablet machine, so that the process is simple and the cost is reduced. The tablets are suitable for disinfecting self-contained source water, storage water, swimming pool water, cistern, rural concentrated water supply and urban high-rise secondary water supply; and 30 tablets are added into each ton of water and the disinfection effect can last for 35 and 40 days.

Description

technical field [0001] The invention relates to a drinking water disinfection agent and a preparation method, belonging to the field of drinking water disinfection. Background technique [0002] Self-provided source water, stored water, urban high-rise secondary water supply and centralized water supply have the risk of being contaminated by microorganisms during storage and placement, so disinfection is required during use, and slow-release disinfection is an effective way to facilitate the disinfection of such water Way. The disadvantages of the currently commonly used slow-release disinfectants are: 1. The slow release time in water is relatively short, generally only 4-13 days. For disinfection that requires long-term water storage, it is necessary to increase the number of doses; 2. Slow release Disinfectants can change the pH of the raw water, which is not suitable for drinking; 3, general tablet presses cannot be used during preparation but need to adopt high-pressur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01N25/34A01N43/50A01P1/00C02F1/50
Inventor 尹静杨忠委王华然李迎凯王福玉孙欣
Owner INST OF HYGIENE & ENVIRONMENTAL MEDICINE PLA ACAD OF MILITARY MEDICAL
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