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Production method of slow release polycarboxylate water reducer

A technology of slow-release polycarboxylate and its manufacturing method, which is applied in the field of preparation of slow-release polycarboxylate water reducer, which can solve problems such as unfavorable construction, high viscosity, and great difference in concrete slump retention, and achieve good compatibility sexual effect

Inactive Publication Date: 2019-02-12
昆明巴赛科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a manufacturing method of a slow-release polycarboxylate water reducer, to solve the problem that the existing polycarboxylate water reducer proposed in the above background technology also has strong temperature sensitivity in the process of preparation and use , the same polycarboxylate superplasticizer is constructed in different seasons, and the slump retention of concrete is very different; there are few functional products, and it is difficult to meet the requirements of ultra-high, ultra-long-distance concrete pumping, negative temperature construction, and ultra-early strength concrete. Preparation and high durability of concrete and other requirements; high viscosity, in the preparation of high admixture and low water-binder ratio concrete, the high viscosity of concrete is not conducive to construction problems

Method used

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  • Production method of slow release polycarboxylate water reducer

Examples

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Comparison scheme
Effect test

Embodiment 1

[0023] A kind of manufacture method of slow-release polycarboxylate superplasticizer, comprises the steps:

[0024] Step 1: Preparation of raw materials: isopentenol polyoxyethylene ether (TPEG), hydrogen peroxide (H 2 o 2 ), acrylic acid (AA), hydroxyethyl acrylate, vinyl acetate, vitamin C, chain transfer agent, water retention agent, liquid caustic soda (NaOH), deionized water; Based on the characteristics of slow hydrolysis under alkaline conditions, it has the effect of slow release and slump protection;

[0025] Step 2: Dissolving and heating up: add deionized water and prenol polyoxyethylene ether (TPEG) to the biscuits equipped with a stirrer and a thermometer, stir to dissolve, and heat up to 52°C;

[0026] Step three: Hydrogen peroxide (H 2 o 2 ) adding: after the mixed solution is heated in the beaker of step 2, add hydrogen peroxide (H 2 o 2 );

[0027] Step 4: aging and adding water retaining agent: hydrogen peroxide (H 2 o 2 ) after the addition of acryl...

Embodiment 2

[0031] A kind of manufacture method of slow-release polycarboxylate superplasticizer, comprises the steps:

[0032] Step 1: Preparation of raw materials: isopentenol polyoxyethylene ether (TPEG), hydrogen peroxide (H 2 o 2 ), acrylic acid (AA), hydroxyethyl acrylate, vinyl acetate, vitamin C, chain transfer agent, water retention agent, liquid caustic soda (NaOH), deionized water; Based on the characteristics of slow hydrolysis under alkaline conditions, it has the effect of slow release and slump protection;

[0033] Step 2: Dissolving and heating up: Add deionized water and prenol polyoxyethylene ether (TPEG) to the biscuits equipped with a stirrer and a thermometer, stir to dissolve, and heat up to 55°C;

[0034] Step three: Hydrogen peroxide (H 2 o 2 ) adding: after the mixed solution is heated in the beaker of step 2, add hydrogen peroxide (H 2 o 2 );

[0035] Step 4: aging and adding water retaining agent: hydrogen peroxide (H 2 o 2 ) after the addition of acryl...

Embodiment 3

[0039] A kind of manufacture method of slow-release polycarboxylate superplasticizer, comprises the steps:

[0040] Step 1: Preparation of raw materials: isopentenol polyoxyethylene ether (TPEG), hydrogen peroxide (H 2 o 2 ), acrylic acid (AA), hydroxyethyl acrylate, vinyl acetate, vitamin C, chain transfer agent, water retention agent, liquid caustic soda (NaOH), deionized water; Based on the characteristics of slow hydrolysis under alkaline conditions, it has the effect of slow release and slump protection;

[0041] Step 2: Dissolving and heating up: add deionized water and prenol polyoxyethylene ether (TPEG) to the biscuits equipped with a stirrer and a thermometer, stir to dissolve, and heat up to 58°C;

[0042] Step three: Hydrogen peroxide (H 2 o 2 ) adding: after the mixed solution is heated in the beaker of step 2, add hydrogen peroxide (H 2 o 2 );

[0043] Step 4: aging and adding water retaining agent: hydrogen peroxide (H 2 o 2 ) after the addition of acryl...

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Abstract

The invention discloses a production method of a slow release polycarboxylate water reducer. The production method comprises the following steps that raw materials are prepared; the raw materials aredissolved and heated; hydrogen peroxide (H2O2) is added; a mixed solution is aged, and a water retaining agent is added; a finished product is obtained. The production method has the beneficial effects that the carboxyl on part of carboxylic acid main chains is substituted by ester group, and the effect of slow releasing and slump loss resistance is achieved by utilizing the feature that the estergroup is slowly hydrolyzed under an alkaline condition. The prepared slow release polycarboxylate water reducer has slow release feature, good compability with different cement, and specific initialwater reducing rate.

Description

technical field [0001] The invention belongs to the technical field of preparation of slow-release polycarboxylate water-reducers, and in particular relates to a manufacturing method of slow-release polycarboxylate water-reducers. Background technique [0002] Carboxylic acid superplasticizer is a high-performance water reducing agent and a cement dispersant in the application of cement concrete; it is widely used in highways, bridges, dams, tunnels, high-rise buildings and other projects. As a new type of water reducer, polycarboxylate water reducer has the advantages of low dosage, high water reducing rate, good slump retention and less pollution compared with traditional aliphatic, naphthalene, amino and other water reducers. [0003] There are also some unreasonable factors in the process of preparation and use of existing polycarboxylate water reducers: [0004] 1. Strong temperature sensitivity, the same polycarboxylate superplasticizer is constructed in different sea...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F220/20C08F218/08C08F2/38C04B24/26C04B103/30
CPCC04B24/2694C04B2103/302C08F2/38C08F283/065C08F220/06
Inventor 尚开远
Owner 昆明巴赛科技有限公司
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