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A kind of preparation method of mortar thickener

A thickener and mortar technology, applied in the field of construction mortar thickener, can solve problems such as bleeding, low strength, and unsatisfactory operability of mortar, so as to improve water retention rate, high viscosity, and prevent water from evaporating too quickly Effect

Active Publication Date: 2020-07-24
广西御华混凝土有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a preparation method of a mortar thickener in view of the problems of low strength, serious bleeding and unsatisfactory operability of mortar commonly found in current mortar thickeners

Method used

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Examples

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Effect test

preparation example Construction

[0023] A preparation method of a mortar thickener, comprising the steps of:

[0024] (1) Take cornstarch and mix it with absolute ethanol according to the mass ratio of 1:6~8, pass in nitrogen, stir and mix for 15~20min, then add 90~95% of the mass fraction of cornstarch with 48% sodium hydroxide aqueous solution , keep warm at 25~30°C for 1~2h to obtain mixture A, take mixture A and add monochloroacetic acid at a mass ratio of 5~7:2, heat up to 50~55°C and stir for 2~3h, cool, and adjust the pH to 6.5~ 6.8, filter with suction, take the filter residue, wash it with 85% ethanol by mass fraction, and dry it in vacuum to obtain dry powder;

[0025] (2) In terms of parts by mass, take 20-25 parts of sugarcane black liquor, 15-20 parts of ethylenediamine, and 80-90 parts of deionized water, adjust the pH to 10-12, and heat up to 80-85°C for 1 ~2h, then add 10~20% formaldehyde of sugarcane black liquor, keep it warm for 2~3h, cool to room temperature, get cooling substance A, take...

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Abstract

The invention discloses a method for preparing a mortar thickener and belongs to the field of construction. Corn starch is taken as a raw material to improve the substitution effect of carboxymethyl starch, which can prevent mortar from being separated and bleeding and can prevent water from evaporating too quickly in the early stage of curing or being absorbed too quickly by a base material, so that cement can be well hydrated; sugarcane black liquid is taken as a raw material for amination, positive ion groups are introduced in the molecular structure of lignin, so that the air-entraining performance is achieved, and the anti-cracking, anti-seepage and retarding effects are improved; propylene-based polyoxyethylene ether and maleic anhydride and the like are adopted as raw materials, anair-entraining delayed coagulation thickener additive is synthesized, and the mortar thickener has excellent performances such as good water reducing effect, good delayed coagulation effect and low air entrainment and the like. The peaceability of a mixture can be effectively improved, the water-reducing rate is high, the plasticity is strong, the slump loss is small, the amount of cement used canbe greatly reduced, and the cost performance of mortar is effectively improved.

Description

technical field [0001] The invention relates to the construction field, in particular to a construction mortar thickener. Background technique [0002] The rapid development of mortar in the country makes the related technology of mortar more and more important. Compared with traditional mortar preparation technology, one of the technical cores of mortar is mortar additive, which determines the quality, cost and performance of mortar. It can also be said that whether mortar has market competitiveness depends on the use of mortar additives. [0003] At present, the water-retaining thickening additives used by domestic enterprises producing ordinary mortar mainly include cellulose ethers, digested lime powder, and water-retaining thickening materials based on non-lime inorganic materials. Among them, cellulose ethers are better in use, but due to their high price and the small amount added to the mortar, it is difficult to measure and control, and it is difficult to disperse...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/38C04B103/44
CPCC04B40/0039C04B2103/44C04B24/38C04B24/026C04B22/062C04B24/04C04B24/121C04B24/008C04B24/124C04B24/16C04B22/142C04B24/32C04B22/143C04B18/22
Inventor 王敏庄文琴刘红妹
Owner 广西御华混凝土有限责任公司
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