Termite-resistant concrete and preparation method thereof

A technology for concrete and chlorpyrifos is applied in the field of anti-termite concrete and its preparation, termite control, and can solve problems such as erosion and damage, and achieve the effects of improving the validity period, simple process and solving engineering problems.

Active Publication Date: 2019-09-06
WUHAN UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0006] The present invention aims to provide an anti-termite concrete and its preparation method to solve the problem of termite erosion and damage to concrete structures in actual engineering

Method used

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  • Termite-resistant concrete and preparation method thereof
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  • Termite-resistant concrete and preparation method thereof

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preparation example Construction

[0036] The preparation method of chlorpyrifos microcapsules comprises steps:

[0037] The first step prepares urea-formaldehyde resin prepolymer;

[0038] In the second step, the former drug of chlorpyrifos is dissolved in xylene solution, and then an emulsifier is added to obtain a chlorpyrifos emulsion;

[0039] The third step is to mix the chlorpyrifos emulsion with the urea-formaldehyde resin prepolymer, slowly adjust the pH value of the mixture to 2.0-3.0, and carry out the acidification stage of the in-situ polymerization reaction;

[0040] In the fourth step, the curing agent is added into the mixed solution to carry out the curing stage of the in-situ polymerization reaction to obtain chlorpyrifos microcapsules with urea-formaldehyde resin as the wall material.

[0041] In the first step, urea and formaldehyde aqueous solution with a molar ratio of 1:1.75 are mixed to adjust the pH value to 8.0-9.0, specifically, triethanolamine is used to adjust the pH value. Raise ...

Embodiment 1

[0056] Preparation of Chlorpyrifos Microcapsules.

[0057] In the first step, 6g of urea and 14.1g of formaldehyde solution with a mass fraction of 37%, n(urea):n(formaldehyde)=1:1.75, are added to a 500ml Erlenmeyer flask, stirred to fully dissolve urea, and adjusted with triethanolamine The pH of the solution was 8.0-9.0, and then refluxed and stirred at a speed of 450 rpm in a constant temperature water bath at 70° C. for 1 hour to obtain a urea-formaldehyde resin prepolymer.

[0058] In the second step, the former drug of 18g chlorpyrifos is dissolved in 6g benzene, and 1.2g styrene-maleic anhydride copolymer and 0.3g polyvinyl alcohol emulsifier are weighed in addition, mixed with the previously prepared urea-formaldehyde resin prepolymer, Under constant temperature water bath at 40°C, stir at 800rpm for 30-40min to obtain a stable chlorpyrifos emulsion.

[0059] The third step is to dissolve 0.4g NaCl with a certain amount of distilled water, add it to the mixture of ch...

Embodiment 2

[0070] Embodiment 2 is roughly the same process as Embodiment 1, but the stirring speed is changed to 600rpm and 500rpm respectively in the emulsification stage and acidification stage in the preparation of chlorpyrifos microcapsules. And the amount of microcapsules in concrete increased from 86.08g to 172.16g. Specific steps are as follows:

[0071] Preparation of Chlorpyrifos Microcapsules.

[0072] In the first step, 6g of urea and 14.1g of formaldehyde solution with a mass fraction of 37%, n(urea):n(formaldehyde)=1:1.75, are added to a 500ml Erlenmeyer flask, stirred to fully dissolve urea, and adjusted with triethanolamine The pH of the solution was 8.0-9.0, and then refluxed and stirred at a speed of 450 rpm in a constant temperature water bath at 70° C. for 1 hour to obtain a urea-formaldehyde resin prepolymer.

[0073] In the second step, the former drug of 18g chlorpyrifos is dissolved in 6g benzene, and 1.2g styrene-maleic anhydride copolymer and 0.3g polyvinyl alc...

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Abstract

The invention relates to termite-resistant concrete and a preparation method thereof. The termite-resistant concrete is obtained by doping concrete with chlorpyrifos microcapsules which can be used for preventing and controlling termites. The preparation method specifically includes the steps that (1) a sufficient amount of cement is weighed, an appropriate proportion of the chlorpyrifos microcapsules is added, and the mixture is stirred until the mixture is uniformly dispersed; (2) a sufficient amount of coarse aggregate and a sufficient amount of fine aggregate are weighed and stirred uniformly; (3) the cement doped with the chlorpyrifos microcapsules is added into the mixed aggregate and stirred uniformly; (4) a corresponding mass of water and a corresponding mass of a water reducing agent are weighed, mixed and stirred uniformly and then added into the mixture above; (5) the concrete mixture is loaded into a test mold and subjected to inserted tamping or vibrated tamping until bleeding on the surface; (6) the concrete paste overflowing on the test mold is scraped off, and the test mold is placed for 24 hours; (7) after the mold is removed, a sample is cured for 28 days. The preparation method of the termite-resistant concrete is simple in process, practical and economical, the termites can be effectively prevented and controlled, the engineering problem that the termites destroy concrete structures is solved, and the concrete has an important practical engineering application value.

Description

technical field [0001] The invention belongs to the field of civil engineering and relates to a termite control technology, in particular to an anti-termite concrete and a preparation method thereof. Background technique [0002] With the continuous development of science and technology and social economy, engineering construction has higher and higher performance requirements for concrete. Through years of engineering practice, it has been found that in areas where termite colonies are densely distributed, there is a phenomenon that concrete projects are damaged by termite erosion. The main reason is that most of the current concrete pouring uses water-reducing agents, and the retarding ingredients in water-reducing agents are mostly sugars. Termites are easily attracted by sugars, causing a large number of termites to gather in the concrete. The interior of the concrete is a strong alkali environment. The formic acid (namely formic acid) secreted by termites can react wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00B28B1/04A01N57/16A01N25/28A01P7/04
CPCA01N25/28A01N57/16B28B1/045C04B28/00C04B2111/20C04B14/02C04B2103/302C04B2103/67C04B24/307C04B20/1037
Inventor 刘数华巫美强孔庆林范雪强沈杰杰张磊黄鑫
Owner WUHAN UNIV
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