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A kind of early-strength polycarboxylate water reducer and preparation method thereof

A water-reducing agent and early-strength type technology, which is applied in the field of building material admixtures, can solve the problems of polycarboxylate water-reducing agent with poor comprehensive performance, long initial setting time and final setting time, and failure to meet the use requirements, etc. Excellent water effect, improved water reduction effect, and improved durability

Active Publication Date: 2016-06-29
山西中铁铁诚建材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the above scheme has improved the existing technology to a certain extent, the comprehensive performance of the polycarboxylate superplasticizer prepared by this method is poor, such as high gas content, long initial setting time and final setting time, etc. , unable to meet the requirements of some special occasions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In the first step, weigh 243Kg polyether, 1.6Kg hydrogen peroxide, the concentration of hydrogen peroxide is 30%, add 228Kg deionized water into the reaction kettle, heat the steam to 60±3℃, and prepare the base material;

[0032] The second step is to prepare material A, weigh 36Kg of acrylic acid, 1.8Kg of mercaptopropionic acid and 82Kg of deionized water, stir evenly and pump into the high level tank for later use;

[0033] The third step is to prepare material B, weigh 1.9Kg of vitamin C and add 113Kg of deionized water, stir evenly and pump it into the high level tank for later use;

[0034] In the fourth step, when the temperature of the bottom material rises to 57°C, start to add material A and material B dropwise at the same time, add material A dropwise for 3 hours, add material B dropwise for 2.5 hours, and keep warm for 1.5 hours after the dropwise addition is completed to obtain the mixed solution I;

[0035] The fifth step, take 15Kg of caustic soda and ad...

Embodiment 2

[0039] In the first step, weigh 200Kg polyether, 1Kg hydrogen peroxide, the concentration of hydrogen peroxide is 30%, add 200Kg deionized water into the reaction kettle, heat the steam to 60±3℃, and prepare the base material;

[0040] The second step is to prepare material A, weigh 30Kg of acrylic acid, 1Kg of mercaptopropionic acid and 70Kg of deionized water, stir evenly and pump into the high level tank for later use;

[0041] The third step is to prepare material B, weigh 1Kg of vitamin C and add 100Kg of deionized water, stir evenly and pump it into the high level tank for later use;

[0042] In the fourth step, when the temperature of the bottom material rises to 57°C, start to add material A and material B dropwise at the same time, add material A dropwise for 3 hours, add material B dropwise for 2.5 hours, and keep warm for 1.5 hours after the dropwise addition is completed to obtain the mixed solution I;

[0043] Step 5: Take 10Kg of caustic soda and add 30Kg of wate...

Embodiment 3

[0047] In the first step, weigh 200Kg polyether, 1Kg hydrogen peroxide, the concentration of hydrogen peroxide is 30%, add 200Kg deionized water into the reaction kettle, heat the steam to 60±3℃, and prepare the base material;

[0048] The second step is to prepare material A, weigh 30Kg of acrylic acid, 1Kg of mercaptopropionic acid and 70Kg of deionized water, stir evenly and pump into the high level tank for later use;

[0049] The third step is to prepare material B, weigh 1Kg of vitamin C and add 100Kg of deionized water, stir evenly and pump it into the high level tank for later use;

[0050] In the fourth step, when the temperature of the bottom material rises to 57°C, start to add material A and material B dropwise at the same time, add material A dropwise for 3 hours, add material B dropwise for 2.5 hours, and keep warm for 1.5 hours after the dropwise addition is completed to obtain the mixed solution I;

[0051] Step 5: Take 10Kg of caustic soda and add 30Kg of wate...

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Abstract

The invention discloses an early-strength type polycarboxylate superplasticizer and a preparation method thereof. The polycarboxylate superplasticizer comprises the following raw materials: polyether, hydrogen peroxide, acrylic acid, thiohydracrylic acid, vitamin C, caustic soda flakes, calcium nitrate, sodium nitrite, triethanolamine, deionized water and softened water. The ratio of an initiator to a linker to other raw materials is optimized, the deionized water which does not contain chlorine is selected, and the softened water with excellent dispersing performance is used. Moreover, the polycarboxylate superplasticizer, the softened water, the calcium nitrate, sodium nitrite and the triethanolamine are simultaneously used, and the reaction parameters are optimized, so that the early-strength type polycarboxylate superplasticizer has advantages in key indexes such as the water-reducing rate, bleeding rate, gas content, difference in setting time, ratio of compressive strength and ratio of shrinkage. The early-strength type polycarboxylate superplasticizer is excellent in service effect and obvious in cost advantage and is worthy of wide-range popularization.

Description

technical field [0001] The invention specifically relates to an early-strength polycarboxylate high-performance water reducer, which belongs to the field of building material admixtures. Background technique [0002] Early-strength water-reducing agent has no corrosion effect on steel bars, has the advantages of non-toxic and non-polluting, and can be applied to reinforced concrete or prestressed concrete structures of roads, bridge dyeing and ports, industrial and civil buildings, steam curing and natural curing In the construction of prefabricated components, etc., it is an admixture with both early strength and water reducing functions, generally composed of early strength and water reducing agents in a certain proportion; early strength water reducing agents have certain early strength, It is a natural maintenance admixture for water reduction and enhancement. Due to differences in geographical location, in order to improve the early strength of concrete (especially in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/32C08F283/06C08F220/06C04B103/30
Inventor 周勇
Owner 山西中铁铁诚建材科技有限公司
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