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A kind of open time regulator of ready-mixed mortar and its preparation method

A technology of open time and ready-mixed mortar, which is applied in the field of building materials, can solve the problems of shortened open time, loss of consistency, and poor work performance of mortar, and achieve good open time adjustment performance, no negative impact on strength, and good work performance. Effect

Active Publication Date: 2020-11-17
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Ordinary ready-mixed mortar, due to one-time mixing, has a large volume, and must be stored in the mortar tank when it is transported to the site, and the mortar is used for a long time, often resulting in mortar sedimentation, loss of consistency, and poor work performance. At this time, there are often secondary The phenomenon of secondary water addition makes the mechanical properties of the mortar unable to meet the requirements; in the environment of high temperature, the opening time of the mortar is shortened, and there is a phenomenon of waste of materials

Method used

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  • A kind of open time regulator of ready-mixed mortar and its preparation method

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Comparison scheme
Effect test

Embodiment 1

[0020] Weigh 60g of phosphorous acid, 60g of sodium tripolyphosphate, 1g of ferrous nitrate and 150g of water into the reactor and stir to dissolve; under the condition of ultraviolet light irradiation, heat up to about 60°C, keep the temperature constant, and drop while stirring Add 20g of maleic anhydride, and simultaneously dropwise add 50g of hydroxyethyl acrylate, and continue to react for 1 hour after the dropwise addition is completed within 3 hours; after natural cooling to room temperature, continue to add 20g of sodium gluconate, 10g of sodium gluconate and 1g of stabilizer to remove Sodium hydroacetate and stir evenly; add alkaline solution to adjust the pH value to 6-8, add water to the total mass of 1000g, and stir evenly to obtain the finished product.

Embodiment 2

[0022] Weigh 80g of phosphite diester, 50g of sodium metaphosphate, 1g of ferrous nitrate and 150g of water into the reactor and stir to dissolve; under the condition of ultraviolet light irradiation, heat up to about 60°C, keep the temperature constant, and stir Add 20g of maleic anhydride dropwise, and simultaneously add 60g of hydroxyethyl acrylate dropwise. After the dropwise addition is completed within 3 hours, continue to react for 1 hour; after naturally cooling to room temperature, continue to add 20g of sodium gluconate, 10g of sodium gluconate and 1g of stabilizer Sodium dehydroacetate and stir evenly; add alkaline solution to adjust the pH value to 6-8, add water to a total mass of 1000g, and stir evenly to obtain the finished product.

Embodiment 3

[0024] Weigh 80g of phosphorous acid, 60g of sodium tripolyphosphate, 1g of ferrous nitrate and 150g of water into the reactor and stir to dissolve; under the condition of ultraviolet light irradiation, heat up to about 60°C, keep the temperature constant, and drop while stirring Add 15g of fumaric acid, and simultaneously dropwise add 50g of hydroxyethyl acrylate, control the dropwise addition within 3 hours and continue to react for 1 hour; after natural cooling to room temperature, continue to add 20g of sodium gluconate, 10g of sodium gluconate and 1g of stabilizer to remove Sodium hydroacetate and stir evenly; add alkaline solution to adjust the pH value to 6-8, add water to the total mass of 1000g, and stir evenly to obtain the finished product.

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Abstract

The invention belongs to the technical field of building materials, and particularly relates to a regulator for opening time of premix mortar and a preparation method thereof. The regulator is prepared from the following components in percentage by mass: 2 to 8% of phosphoric acid or phosphate ester, 5 to 10% of phosphate, 1 to 5% of maleic anhydride or fumaric acid, 5 to 10% of hydroxyethyl acrylate, 1% of metal salt catalyst, 1 to 5% of hydroxycarboxylic acid, 0.5 to 2% of stabilizer, and the balance of water. The regulator for the opening time of the premix mortar has the advantages that the good opening time regulating property is realized; the regulator is applicable to multiple types of water reduction agent; when various types of mortar are mixed, the mortar can maintain a good working property within the larger opening time range, the stability of the mortar is guaranteed, and the adverse effect to the later strength is avoided.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to an open time regulator of ready-mixed mortar and a preparation method thereof. Background technique [0002] In recent years, under the environment of the country's implementation of energy conservation, environmental protection and sustainable development policies, the government has forcibly prohibited the use of on-site cement mixing mortar, thus accelerating the promotion and popularization of wet mixing mortar. Since the construction technology is different from that of concrete, it needs to be worked in batches one by one, and cannot be used all at once, and needs to be temporarily stored on site. The existence of this phenomenon has relatively high requirements for the retention time of the mortar's working performance. The open time refers to the ability of the mortar to maintain its original state of workability within a certain period of time afte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/26
CPCC04B40/0039C04B22/165C04B22/16C04B22/085C04B22/002C04B24/10C04B24/04C04B24/2664C04B24/045
Inventor 陈友治黄海俊陈洪涛
Owner WUHAN UNIV OF TECH