阅读说明：本技术 一种无碱速凝剂及制备方法 (Alkali-free accelerator and preparation method thereof ) 是由 谢晶 于 2019-02-28 设计创作，主要内容包括：本发明公开了一种无碱速凝剂及制备方法,涉及速凝剂制备技术领域。本发明包括如下制备剂：硫酸铝、柠檬酸钠、聚羧酸减水剂、氨水、增稠剂以及稳定剂；制备剂的比例如下：硫酸铝40％-60％、柠檬酸钠5％-10％、聚羧酸减水剂5％-10％、浓度为15％-25％的氨水5％-10％、稳定剂1％-3％以及增稠剂1％-2％；制备剂与水的比例范围为1:1.1-1:1.3。本发明通过通过硫酸铝、柠檬酸钠以及氨水生成速凝剂,不含金属离子,无腐蚀性和刺激性气味；通过添加稳定剂,稳定性高、适应性强；且制作程序简单,方便快捷。(The invention discloses an alkali-free setting accelerator and a preparation method thereof, and relates to the technical field of setting accelerator preparation. The invention comprises the following preparation agents: aluminum sulfate, sodium citrate, a polycarboxylic acid water reducing agent, ammonia water, a thickening agent and a stabilizing agent; the proportion of the preparation agent is as follows: 40-60% of aluminum sulfate, 5-10% of sodium citrate, 5-10% of polycarboxylic acid water reducing agent, 5-10% of ammonia water with the concentration of 15-25%, 1-3% of stabilizing agent and 1-2% of thickening agent; the ratio of the preparation agent to water is in the range of 1:1.1-1: 1.3. The accelerator is generated by aluminum sulfate, sodium citrate and ammonia water, does not contain metal ions and has no corrosive or pungent smell; by adding the stabilizer, the stability is high and the adaptability is strong; and the manufacturing process is simple, convenient and quick.)

1. An alkali-free accelerator is characterized by comprising the following preparation agents: aluminum sulfate, sodium citrate, a polycarboxylic acid water reducing agent, ammonia water, a thickening agent and a stabilizing agent;

the proportion of the preparation agent is as follows:

40-60% of aluminum sulfate, 5-10% of sodium citrate, 5-10% of polycarboxylic acid water reducing agent, 5-10% of ammonia water with the concentration of 15-25%, 1-3% of stabilizing agent and 1-2% of thickening agent;

the ratio of the preparation agent to water is in the range of 1:1.1-1: 1.3.

2. The alkali-free accelerator according to claim 1, wherein the stabilizer is lactic acid, triethanolamine or a mixture thereof.

3. The alkali-free accelerator according to claim 1, wherein the thickener is polyacrylamide, cellulose or a mixture of the two.

4. The method for preparing the alkali-free accelerator according to claim 1, which comprises the following steps:

the method comprises the following steps: mixing aluminum sulfate, sodium citrate and water, adding the mixture into a generator, heating the mixture to 70-90 ℃, and continuously stirring the mixture until the mixture is dissolved in the heating process;

step two: proportionally mixing the stabilizers, adding the mixture into a generator, heating to 70-90 ℃, and rotating at a high speed in the heating process;

step three: adding a polycarboxylate superplasticizer and ammonia water in corresponding proportion and concentration into a generator, heating to 70-90 ℃, and rotating at high speed in the heating process;

step four: adding the thickening agent into a generator at the temperature of 40-60 ℃, stirring and cooling to form the accelerating agent.

Technical Field

The invention belongs to the technical field of accelerator preparation, and particularly relates to an alkali-free accelerator and a preparation method thereof.

Background

The accelerator is an additive for rapidly setting and hardening cement concrete. The main purpose of the doped accelerating agent is to increase the thickness of a primary sprayed layer of the sprayed concrete, shorten the time interval between 2 times of spraying and improve the early strength of the sprayed concrete so as to provide the supporting resistance in time. Since the production and use of the quick-setting admixture in the last 30 th century, the quick-setting admixture has become one of important constituent materials of shotcrete due to the remarkable characteristics of the quick-setting admixture in the aspects of quick setting and early strength. Particularly, with the increase of the number and scale of underground engineering and different functions, the accelerator is used as a concrete composition material, is quite important and is more indispensable in certain specific engineering, and is widely applied to water conservancy, traffic, mining and partial emergency repair engineering. The accelerator is widely available, and can be roughly classified into 4 types, i.e., alkaline powder, alkali-free powder, alkaline liquid, and alkali-free liquid, depending on the nature and state of the accelerator.

At present, the liquid alkali type accelerating agent has low stability and certain corrosivity and pungent smell in the using process.

Disclosure of Invention

The invention aims to provide an alkali-free accelerator and a preparation method thereof, wherein the accelerator does not contain metal ions and has no corrosive or pungent smell; by adding the stabilizer, the stability is high, the adaptability is strong, and the problems that the existing liquid alkali type accelerating agent is not high in stability and has certain corrosivity and pungent smell in the use process are solved.

In order to solve the technical problems, the invention is realized by the following technical scheme:

the invention relates to an alkali-free accelerator, which comprises the following preparation agents: aluminum sulfate, sodium citrate, a polycarboxylic acid water reducing agent, ammonia water, a thickening agent and a stabilizing agent;

the proportion of the preparation agent is as follows:

40-60% of aluminum sulfate, 5-10% of sodium citrate, 5-10% of polycarboxylic acid water reducing agent, 5-10% of ammonia water with the concentration of 15-25%, 1-5% of polyacrylamide, 1-3% of stabilizer and 1-2% of thickener;

the ratio of the preparation agent to water is in the range of 1:1.1-1: 1.3.

Preferably, the stabilizer is lactic acid, triethanolamine or a mixture of the two.

Preferably, the thickener is polyacrylamide, cellulose or a mixture of the two.

A preparation method of an alkali-free accelerator comprises the following steps:

the method comprises the following steps: mixing aluminum sulfate, sodium citrate and water, adding the mixture into a generator, heating the mixture to 70-90 ℃, and continuously stirring the mixture until the mixture is dissolved in the heating process;

step two: proportionally mixing the stabilizers, adding the mixture into a generator, heating to 70-90 ℃, and rotating at a high speed in the heating process;

step three: adding a polycarboxylate superplasticizer and ammonia water in corresponding proportion and concentration into a generator, heating to 70-90 ℃, and rotating at high speed in the heating process;

step four: adding the thickening agent into a generator at the temperature of 40-60 ℃, stirring and cooling to form the accelerating agent.

The invention has the following beneficial effects:

the accelerator is generated by aluminum sulfate, sodium citrate and ammonia water, does not contain metal ions and has no corrosive or pungent smell; by adding the stabilizer, the stability is high and the adaptability is strong; and the manufacturing process is simple, convenient and quick.

Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a flow chart of a preparation method of an alkali-free accelerator of the invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.