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A slow-release polycarboxylate water reducer and its preparation method and application

A slow-release polycarboxylate and water-reducing agent technology, which is applied in the field of building materials, can solve problems such as difficult control of construction and vibration process, impact on durability and corrosion resistance, and many concrete bubbles, and achieve good water-reducing performance and slump retention performance, low production cost, and high water reduction efficiency

Inactive Publication Date: 2018-02-23
SHANDONG JINGJIN NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the polycarboxylic acid itself has a certain air-entraining ability, and it is difficult to control during construction and vibration, resulting in too many air bubbles on the concrete surface, which affects the surface quality and has a great impact on durability and corrosion resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In the embodiment of the present invention, a slow-release polycarboxylate water reducer is composed of the following raw materials in parts by weight: 50 parts of polymethacrylic acid, 22 parts of castor beans, 5 parts of menthone, 8 parts of chitin, high iron Potassium acid 1 part, formic acid 33 parts.

[0022] Dry castor beans, crush them, pass through a 100-mesh sieve, add cyclohexane 25 times its mass, raise the temperature to 50°C, seal and heat and stir for 20 minutes, then raise the temperature to 60°C, seal and heat and stir for 30 minutes, filter to obtain the supernatant Processed castor bean mixture. Mix castor bean mixture and chitin, and heat and stir at 65°C for 20 minutes to prepare mixture A. Mix polymethacrylic acid and formic acid, then add deionized water 15 times the mass of the two, raise the temperature to 85°C, heat and stir for 30 minutes, then cool down to 65°C, add menthone, and heat and stir at this temperature for 50 minutes; Mixture B is...

Embodiment 2

[0024] In the embodiment of the present invention, a slow-release polycarboxylate water reducer is composed of the following raw materials in parts by weight: 58 parts of polymethacrylic acid, 30 parts of castor beans, 12 parts of menthone, 15 parts of chitin, high iron Potassium acid 5 parts, formic acid 40 parts.

[0025] Dry castor beans, crush them, pass through a 200-mesh sieve, add cyclohexane 30 times the mass, raise the temperature to 55°C, seal and heat and stir for 30 minutes, then raise the temperature to 65°C, seal and heat and stir for 40 minutes, filter to obtain the supernatant Processed castor bean mixture. Mix castor bean mixture and chitin, and heat and stir at 70°C for 30 minutes to prepare mixture A. Mix polymethacrylic acid and formic acid, then add deionized water 18 times the mass of the two, raise the temperature to 90°C, heat and stir for 40 minutes, then cool down to 70°C, add menthone, and heat and stir at this temperature for 60 minutes; Mixture B...

Embodiment 3

[0027] In the embodiment of the present invention, a slow-release polycarboxylate water reducer is composed of the following raw materials in parts by weight: 52 parts of polymethacrylic acid, 24 parts of castor beans, 7 parts of menthone, 10 parts of chitin, high iron Potassium acid 2 parts, formic acid 35 parts.

[0028] Dry castor beans, crush them, pass through a 200-mesh sieve, add cyclohexane 28 times its mass, raise the temperature to 52°C, seal and heat and stir for 25 minutes, then raise the temperature to 62°C, seal and heat and stir for 35 minutes, filter to obtain the supernatant Processed castor bean mixture. Mix castor bean mixture and chitin, and heat and stir at 70°C for 25 minutes to prepare mixture A. Mix polymethacrylic acid and formic acid, then add deionized water 18 times the mass of the two, raise the temperature to 87°C, heat and stir for 35min, then cool down to 67°C, add menthone, and heat and stir at this temperature for 55min; Mixture B is obtaine...

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PUM

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Abstract

The invention discloses sustained-release polycarboxylate superplasticizer and a preparation method and application thereof.The sustained-release polycarboxylate superplasticizer is prepared from, by weight, 50-58 parts of polymethylacrylic acid, 22-30 parts of castor beans, 5-12 parts of menthone, 8-15 parts of chitosan, 1-5 parts of potassium ferrate and 33-40 parts of formic acid.The castor beans are dried, smashed and sieved, cyclohexane is added into the sieved castor bean powder, sealing heating is conducted, and supernatant liquid is extracted after filtering; the supernatant liquid and chitosan are mixed, sealing heating is conducted, and a mixture A is obtained; polymethylacrylic acid and formic acid are mixed, deionized water is added, heating and stirring are conducted, menthone is added, heating and stirring are conducted, and a mixture B is obtained; the mixture A and the mixture B are mixed, and after heating and stirring are conducted, potassium ferrate is added, heating is conducted, and the sustained-release polycarboxylate superplasticizer is prepared.The sustained-release polycarboxylate superplasticizer has sustained-release performance, the water reducing efficiency is higher, good water reducing performance and slump retaining performance are shown, the sustained-release polycarboxylate superplasticizer also has the defoaming function, sources of the raw materials are wide, the production technology is simple, cost is low, no environment pollution is caused, and the sustained-release polycarboxylate superplasticizer is suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a slow-release polycarboxylate water reducer and its preparation method and application. Background technique [0002] Water reducer is a concrete admixture that can reduce the amount of mixing water while maintaining the slump of concrete. Most of them are anionic surfactants, such as lignosulfonate, naphthalenesulfonate formaldehyde polymer, etc. After being added to the concrete mixture, it can disperse the cement particles, improve its workability, reduce the unit water consumption, improve the fluidity of the concrete mixture; or reduce the unit cement consumption and save cement. [0003] According to the chemical composition, it is usually divided into: lignosulfonate-based superplasticizers, naphthalene-based superplasticizers, melamine-based superplasticizers, sulfamate-based superplasticizers, and fatty acid-based superplasticizers. Water agents, polycarbox...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/24C04B103/30
CPCC04B24/24C04B2103/302
Inventor 董明
Owner SHANDONG JINGJIN NEW ENERGY CO LTD
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