High-efficiency novel thickener and preparation method thereof

Abstract

The invention is applicable to the technical field of concrete additives, and particularly relates to a novel high-efficiency thickener and a preparation method thereof, the novel high-efficiency thickener comprises a cellulose ether, b a thickener, c sodium dodecyl sulfate, d diethanol amine, e triethanolamine and f a polycarboxylic acid water reducer. The high-efficiency novel thickener provided by the invention has very high thermal stability, an aqueous solution compounded with carboxylic acid does not influence any performance such as air entraining after spray drying, has no special storage requirements, can be stored for one year, has good compatibility with cement, has a slump retaining effect under the condition of a proper mixing amount, and can be dissolved in advance with boiled water during production and use, so that the viscosity of the thickener is reduced, and the viscosity of the thickener is reduced. The preparation method comprises the following steps: adding the raw materials into water, stirring, sequentially adding the water reducing agent master batch and the auxiliary materials, and stirring, so that the anti-freezing durable compactness of the concrete is greatly improved after the thickening agent is doped.

Description

Technical Field

[0001] This invention belongs to the field of concrete additive technology, and particularly relates to a novel high-efficiency thickener and its preparation method. Background Technology

[0002] Concrete thickeners are chemical additives that significantly improve the cohesiveness and water retention of concrete mixtures. By increasing the viscosity of the paste, they effectively coat the aggregates, preventing segregation and bleeding during transportation and pouring, thus ensuring the uniformity and stability of the concrete. This not only improves pumpability and smoothness during construction but also reduces surface defects after construction, ultimately guaranteeing the quality and durability of the concrete.

[0003] Currently, manufactured sand on the market is prone to problems such as generally coarse fineness modulus, lack of natural sand filling leading to concrete segregation, bleeding, poor workability, unsuitability for pumping, poor fluidity of underwater concrete, and excessive stickiness in high-grade concrete. Summary of the Invention

[0004] The purpose of this invention is to provide a novel, highly efficient thickener that addresses the problems currently found in the market, such as the generally coarse fineness modulus of manufactured sand, the lack of natural sand filling leading to concrete segregation, bleeding, poor workability, unsuitability for pumping, poor fluidity of underwater concrete, and excessive stickiness in high-grade concrete.

[0005] The present invention is achieved as follows: a) a highly efficient novel thickener, comprising: a) cellulose ether, b) thickener, c) sodium dodecyl sulfonate, d) diethanolamine, e) triethanolamine, and f) polycarboxylate superplasticizer.

[0006] Preferably, the proportions of each component in the high-efficiency novel thickener are as follows: a) cellulose ether 1%, b) thickener 4%, c) sodium dodecyl sulfonate 1%, d) diethanolamine 2%, e) triethanolamine 2%, and f) polycarboxylate superplasticizer 1%.

[0007] Preferably, the α-cellulose ether is 150,000 units.

[0008] Preferably, sodium dodecyl sulfonate can be replaced by sodium dodecyl sulfate at a ratio of 1:1.

[0009] Another object of the present invention is to provide a method for preparing the novel high-efficiency thickener as described above, the method comprising: Add water to the reactor, then add cellulose ether (a) and thickener (b) in the correct proportions, stir, and let stand. After stirring for another 0.5 hours, add sodium dodecyl sulfonate in the appropriate proportion. After standing for 0.5 hours, add d-diethanolamine, e-triethanolamine and f-polycarboxylate superplasticizer in proportion, continue stirring for 0.5 hours, and let stand for 1 hour to discharge the material to obtain a high-efficiency new type of thickener.

[0010] Preferably, the total proportion of water is 89%.

[0011] Preferably, in the step of adding water to the reaction vessel, adding cellulose ether (a) and thickener (b) in sequence according to the proportion, and then stirring and letting it stand, the stirring and standing time is 1 hour each.

[0012] The novel high-efficiency thickener provided by this invention has high thermal stability. The aqueous solution composed of carboxylic acid does not affect any of its air-entraining or other properties after spray drying. It has no special storage requirements and a shelf life of one year. It has good compatibility with cement and, under appropriate dosage, has a slump-preserving effect. When using it in production, it is best to dissolve it in boiling water in advance, add it to water and stir, and then add the water-reducing agent masterbatch and small particles in sequence and stir. Adding the thickener greatly improves the antifreeze durability and density of concrete. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0014] A novel high-efficiency thickener, wherein the proportions of each component are as follows: a) cellulose ether 1%, b) thickener 4%, c) sodium dodecyl sulfonate 1%, d) diethanolamine 2%, e) triethanolamine 2%, and f) polycarboxylate superplasticizer 1%.

[0015] In this composition, a) cellulose ether is 150,000 units, and c) sodium dodecyl sulfonate can be replaced by sodium dodecyl sulfate at a ratio of 1:1.

[0016] In this invention, a and b are thickening components that increase the bonding strength and mixing performance of concrete, c is an air-entraining component that adjusts the impermeability grade of concrete, and d and e are reinforcing agents for cementitious materials that increase the strength of concrete.

[0017] This invention is an additive specifically designed for shotcrete, suitable for thickening shotcrete in mine shafts, railway tunnels, and underground engineering projects. It is also applicable to ordinary concrete, increasing its viscosity, strength, and resistance to adulteration. The invention involves adding cellulose ether, thickener, sodium dodecyl sulfonate, triethanolamine, and diethanolamine in a specific ratio to a reaction vessel, stirring until homogeneous, and allowing to stand to defoam, thus obtaining a foam stabilizer. This invention features a simple process, wide applicability, and is environmentally friendly and pollution-free.

[0018] The present invention also provides a corresponding preparation method, the method comprising: Add 89% water to the reactor, then add cellulose ether (a) and thickener (b) in sequence according to the proportion. Stir for 1 hour and let stand for 1 hour. After stirring for another 0.5 hours, add sodium dodecyl sulfonate in the appropriate proportion. After standing for 0.5 hours, add d-diethanolamine, e-triethanolamine and f-polycarboxylate superplasticizer in proportion, continue stirring for 0.5 hours, and let stand for 1 hour to discharge the material to obtain a high-efficiency new type of thickener.

[0019] The following comparative experiments illustrate the actual effectiveness of the present invention: Example 1

[0020] Add 89% water to the reactor, then add 1% cellulose ether and 4% thickener in sequence, stir for 1 hour and let stand for 1 hour. After stirring for another 0.5 hours, add 1% sodium dodecyl sulfate according to the ratio and continue stirring for another 0.5 hours; After standing for 0.5 hours, add 1% polycarboxylate superplasticizer, 2% diethanolamine and 2% triethanolamine in proportion, continue stirring for 30 minutes, let stand for 1 hour and then discharge to obtain the thickener.

[0021] Example 2

[0022] Add 91% water to the reactor, then add 1% cellulose and 2% thickener in sequence, stir for 1 hour and let stand for 1 hour. After stirring for another 0.5 hours, add 1% sodium dodecyl sulfonate according to the ratio, and continue stirring for another 0.5 hours; After standing for 0.5 hours, add 1% polycarboxylate superplasticizer, 2% diethanolamine and 2% triethanolamine in proportion, continue stirring for 30 minutes and let stand for 1 hour, then discharge to obtain the thickener.

[0023] Example 3

[0024] Add 85% water to the reactor, then add 1% cellulose ether and 5% thickener in sequence, stir for 1 hour and let stand for 1 hour. After stirring for another 0.5 hours, add 1% sodium dodecyl sulfonate according to the ratio, and continue stirring for another 0.5 hours; After standing for 0.5 hours, add 3% polycarboxylate superplasticizer, 3% diethanolamine and 2% triethanolamine in proportion, continue stirring for 30 minutes and let stand for 1 hour. The viscous agent is then discharged.

[0025] The thickeners prepared through the above examples were compared with ordinary thickeners, and the comparison test results are as follows: thickener Dosage Slump / Spread (mm) 28D strength Water consumption No thickener added -- 215 / 510 32MPa 175 Example 1 of this product 0.4kg 225 / 535 36MPa 165 Example 2 of this product 0.4kg 220 / 520 34MPa 165 Example 3 of this product 0.4kg 215 / 530 34.5MPa 165 Compared to the baseline group without thickener, the use of this thickener significantly reduced water consumption, successfully improved the workability of concrete (both slump and spread were improved), and significantly increased the 28-day compressive strength, achieving multiple optimization effects of water saving, strengthening and improving construction performance.

[0026] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A novel, highly efficient thickener, characterized in that, The highly efficient novel thickener includes: a) cellulose ether, b) thickener, c) sodium dodecyl sulfonate, d) diethanolamine, e) triethanolamine, and f) polycarboxylate superplasticizer.

2. The novel high-efficiency thickener according to claim 1, characterized in that, The proportions of each component in the high-efficiency new thickener are as follows: a) cellulose ether 1%, b) thickener 4%, c) sodium dodecyl sulfonate 1%, d) diethanolamine 2%, e) triethanolamine 2%, and f) polycarboxylate superplasticizer 1%.

3. The novel high-efficiency thickener according to claim 1, characterized in that, The cellulose ether content is 150,000 units.

4. The novel high-efficiency thickener according to claim 1, characterized in that, Sodium dodecyl sulfonate can be replaced by sodium dodecyl sulfate at a ratio of 1:

1.

5. A method for preparing a novel high-efficiency thickener as described in any one of claims 1-4, characterized in that, The method includes: Add water to the reaction vessel, then add cellulose ether (a) and thickener (b) in the correct proportions, stir, and let stand. After stirring for another 0.5 hours, add sodium dodecyl sulfonate in the appropriate proportion. After standing for 0.5 hours, add d-diethanolamine, e-triethanolamine and f-polycarboxylate superplasticizer in proportion, continue stirring for 0.5 hours, and let stand for 1 hour to discharge the material to obtain a high-efficiency new type of thickener.

6. The method for preparing the high-efficiency novel thickener according to claim 5, characterized in that, Water accounts for 89% of the total.

7. The method for preparing the high-efficiency novel thickener according to claim 5, characterized in that, Add water to the reactor, then add cellulose ether (a) and thickener (b) in sequence according to the ratio. In the step of stirring and letting stand, the stirring and standing time is 1 hour each.