Preparation method of a novel long-acting disinfectant using polyvinyl alcohol as a macromolecule retarding material

A polyvinyl alcohol and disinfectant technology, applied in the directions of disinfectants, botanical equipment and methods, plant growth regulators, etc., can solve problems such as health hazards, high residual chlorine value in water bodies, and cumbersome use.

Inactive Publication Date: 2016-01-13
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Common disinfectants currently on the market, such as hypochlorite, sodium dichloroisocyanurate and trichloroisocyanuric acid, generally have poor slow-release properties
When these disinfectants are used, when the one-time dosage is large, the residual chlorine value in the water body will be too high, causing a strong chlorine smell in the water body, and an excessively high oxidation value is also harmful to health.
Therefore, a small amount of input is required to control the residual chlorine value in the water. It is cumbersome to use and is not suitable for use in the army, in the field, in rural water cellars, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Measure 1800ml of deionized water, and slowly pour the deionized water into a 2000ml round bottom flask. Weigh 200 g of complete alcoholysis type polyvinyl alcohol (PVA1799) and pour it into a round bottom flask. Under the condition of heating in a water bath, stir mechanically, and set the temperature of the water bath at 95°C. After heating for 2.5 hours, a viscous and uniform polyvinyl alcohol solution was formed. Cool the polyvinyl alcohol solution for later use.

[0023] Weigh 5.0 g of dichlorhydantoin powder sieved with a 200-mesh standard sieve, weigh 50 g of 10% polyvinyl alcohol solution, pour dichlorohydantoin powder and polyvinyl alcohol into a beaker, and stir with a glass rod to make them Mix well to form a mixture of m (dichlorohydantoin): m (solid polyvinyl alcohol)=1:1. Pour the mixed paste mixture into a plastic bag, put it in a refrigerator at around -20°C, and freeze it for 24 hours. Take out the frozen slow-release disinfectant mixture and thaw i...

Embodiment 2

[0026] Prepare slow-release disinfectant by the method in embodiment 1, wherein m (dichlorohydantoin): m (solid polyvinyl alcohol)=5:1. Take by weighing this slow release disinfectant sample that weight is 0.21 gram, drop into 600mL tap water, measure residual chlorine value in water every day. The residual chlorine value in water can be maintained at 1-3mg / L, and the sustained release time is more than 20 days.

Embodiment 3

[0028] Mix 100 grams of 10% polyvinyl alcohol 1799 aqueous solution with 10 grams of dichlorohydantoin, freeze in a refrigerator for 24 hours, and thaw at room temperature. The thawed gel-like substance is then placed in the refrigerator for secondary freezing. Then thaw at room temperature, cut into small pieces, and let dry. The sustained-release effect was determined according to the sustained-release method in Example 1. The residual chlorine value of the water sample can be stably controlled at the level of 1-4mg / L, and the sustained release period can reach more than 30 days. Since the sample has gone through two freeze-thaw cycles, the interaction between the polyvinyl alcohol molecular skeleton is stronger, and the remaining polyvinyl alcohol blocking material after the slow-release disinfectant is released has higher strength, does not dissolve, does not break, and is easier to Remove from body of water.

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PUM

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Abstract

The invention designs a preparation method of a novel long-acting sanitizer taking polyvinyl alcohol as a macromolecule retardant material. The preparation method comprises the following steps of: stirring and mixing a complete alcoholysis type polyvinyl alcohol solution with a sanitizer, namely dichloro dimethyl hydantoin, subsequently freezing for 24 hours at low temperature, taking out and thawing so as to obtain piece-shaped polyvinyl alcohol gel; and cutting the gel into small pieces and drying so as to obtain the novel long-acting sanitizer which takes polyvinyl alcohol as the continuous phase and sanitizer grains are dispersed therein. When the long-acting sanitizer is used, the polyvinyl alcohol absorbs water to swell up, however, the framework is not dissolved and disintegrated, the sanitizer is slowly released, the residual chlorine value in a water body is stable, and the slow-release time can be more than 30 days; and when dichloro dimethyl hydantoin is completely released, the piece-shaped polyvinyl alcohol retardant material can be taken out from the water body, so that the water body is not polluted.

Description

technical field [0001] The invention relates to a preparation method of a novel long-acting disinfectant using polyvinyl alcohol as a macromolecule retarding material. Background technique [0002] Common disinfectants currently on the market, such as hypochlorite, sodium dichloroisocyanurate and trichloroisocyanuric acid, generally have the problem of poor slow-release properties. When these disinfectants are in use, when the one-time dosage is large, the residual chlorine value in the water body will be too high, causing a strong chlorine smell in the water body, and the high oxidation value is also harmful to health. Therefore, it needs a small amount of input many times to control the residual chlorine value in the water. It is cumbersome to use and is not suitable for use in the army, in the field, in rural water cellars and other places. [0003] The slow-release technology of mixing disinfectants with polymer compounds has been widely used in drinking water disinfect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01N43/50A01N25/04A01P1/00
Inventor 庄俊鹏张曙光郝海军刘杰
Owner BEIJING UNIV OF CHEM TECH
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