阅读说明：本技术 一种早强型聚羧酸减水剂及其制备方法和用途 (Early-strength polycarboxylate superplasticizer and preparation method and application thereof ) 是由 余娟 于 2018-06-14 设计创作，主要内容包括：本发明公开了一种早强型聚羧酸减水剂及其制备方法和用途,该早强型聚羧酸减水剂,由以下按照重量份的原料组成：聚丙烯酸55-63份、乙二胺四乙酸33-42份、累托石5-12份、木香15-23份、聚乙烯亚胺8-14份。向聚丙烯酸中加去离子水,再加入聚乙烯亚胺,热处理后制得聚丙烯酸混合液；将木香研磨、过筛,加无水乙醇加热处理,然后进行超声处理,制得超声处理液A；将累托石粉碎、过筛,然后加入乙二胺四乙酸与去离子水,进行超声处理,制得超声处理液B；将超声处理液A与超声处理液B混合热处理,过滤,取上层清液,再加入聚丙烯酸混合液,热处理即得。本发明具有剂掺量低、早强效果好、防止钢筋锈蚀、抗压强度高等优点。(The invention discloses an early strength type polycarboxylate superplasticizer, a preparation method and application thereof, wherein the early strength type polycarboxylate superplasticizer is prepared from the following raw materials in parts by weight: 55-63 parts of polyacrylic acid, 33-42 parts of ethylene diamine tetraacetic acid, 5-12 parts of rectorite, 15-23 parts of elecampane and 8-14 parts of polyethyleneimine. Adding deionized water into polyacrylic acid, adding polyethyleneimine, and performing heat treatment to obtain a polyacrylic acid mixed solution; grinding and sieving radix aucklandiae, adding anhydrous ethanol, heating, and performing ultrasonic treatment to obtain ultrasonic treatment solution A; grinding rectorite, sieving, adding ethylenediamine tetraacetic acid and deionized water, and performing ultrasonic treatment to obtain ultrasonic treatment liquid B; mixing the ultrasonic treatment liquid A and the ultrasonic treatment liquid B for heat treatment, filtering, taking supernatant, adding a polyacrylic acid mixed liquid, and performing heat treatment to obtain the product. The invention has the advantages of low dosage, good early strength effect, high compressive strength and the like, and can prevent the corrosion of the reinforcing steel bar.)

1. The early-strength polycarboxylate superplasticizer is characterized by comprising the following raw materials in parts by weight: 55-63 parts of polyacrylic acid, 33-42 parts of ethylene diamine tetraacetic acid, 5-12 parts of rectorite, 15-23 parts of elecampane and 8-14 parts of polyethyleneimine.

2. The early strength type polycarboxylate water reducer according to claim 1, which is characterized by comprising the following raw materials in parts by weight: 57-61 parts of polyacrylic acid, 35-40 parts of ethylene diamine tetraacetic acid, 7-10 parts of rectorite, 17-21 parts of elecampane and 10-12 parts of polyethyleneimine.

3. The early strength type polycarboxylate water reducer according to claim 2, which is characterized by comprising the following raw materials in parts by weight: 59 parts of polyacrylic acid, 37 parts of ethylene diamine tetraacetic acid, 8 parts of rectorite, 19 parts of costustoot and 11 parts of polyethyleneimine.

4. A method for preparing the early strength type polycarboxylate superplasticizer according to any one of claims 1 to 3, characterized by comprising the following steps:

1) adding deionized water with the mass 10-12 times of that of polyacrylic acid, stirring for 5-10min, adding polyethyleneimine, heating to 55-60 ℃, and treating at the temperature for 30-40min to obtain polyacrylic acid mixed solution for later use;

2) grinding radix aucklandiae, sieving with 80-120 mesh sieve, adding anhydrous ethanol 8-10 times the mass of radix aucklandiae, heating to 70-75 deg.C, stirring for 20-30min, and performing ultrasonic treatment for 30-40min with ultrasonic power of 800-;

3) crushing rectorite, sieving with a 200-mesh sieve, adding ethylenediamine tetraacetic acid and deionized water with the mass 4-5 times of that of the rectorite, mixing, heating to 70-75 ℃ for ultrasonic treatment, wherein the ultrasonic power is 800-;

4) and (3) mixing the ultrasonic treatment liquid A and the ultrasonic treatment liquid B, heating to 90-95 ℃, stirring for 25-30min, filtering, taking the supernatant, adding a polyacrylic acid mixed solution, stirring at the temperature of 100-110 ℃ for 1-1.5h, and cooling to room temperature to obtain the early strength polycarboxylate superplasticizer.

5. Use of the early strength polycarboxylate water reducer according to any one of claims 1-3 in concrete.

6. The use of the early strength polycarboxylate water reducer in concrete according to claim 5, wherein the addition amount of the early strength polycarboxylate water reducer is 1.5-2.5% of the mass of concrete.

7. The use of the early strength polycarboxylate water reducer in concrete according to claim 6, wherein the addition amount of the early strength polycarboxylate water reducer is 2% of the mass of concrete.

Technical Field

The invention relates to the technical field of building materials, in particular to an early-strength polycarboxylate superplasticizer and a preparation method and application thereof.

Background

The water reducing agent is a concrete admixture capable of reducing the mixing water consumption under the condition of maintaining the slump constant of concrete. Most of them are anionic surfactants, such as lignosulfonate and naphthalene sulfonate formaldehyde polymer. After the concrete mixture is added, the dispersion effect on cement particles is achieved, the workability of the concrete mixture can be improved, the unit water consumption is reduced, and the fluidity of the concrete mixture is improved; or the unit cement consumption is reduced, and the cement is saved. The polycarboxylic acid high-performance water reducing agent (liquid) is a third-generation high-performance water reducing agent developed after a common water reducing agent represented by China wood calcium and a high-efficiency water reducing agent represented by naphthalene, and is the most advanced high-performance water reducing agent in the world at present, and has the highest technological content, the best application prospect and the optimal comprehensive performance. In many projects, in order to accelerate the progress of the project and shorten the construction period, a concrete early strength agent or an early strength water reducing agent is required to accelerate the hydration speed of cement, improve the early strength of the concrete and ensure the smooth completion of the project. However, the traditional naphthalene-based early-strength water reducing agent can not adapt to the use requirements of concrete due to the factors of poor dispersibility, low water reducing rate, unobvious early-strength effect, long concrete setting time and the like.

Disclosure of Invention

The invention aims to provide an early strength type polycarboxylate superplasticizer which is low in dosage, good in early strength effect and capable of preventing reinforcing steel bars from being corroded, and a preparation method and application thereof, so as to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme:

an early strength type polycarboxylate superplasticizer is composed of the following raw materials in parts by weight: 55-63 parts of polyacrylic acid, 33-42 parts of ethylene diamine tetraacetic acid, 5-12 parts of rectorite, 15-23 parts of elecampane and 8-14 parts of polyethyleneimine.

As a further scheme of the invention: the early-strength polycarboxylate superplasticizer is prepared from the following raw materials in parts by weight: 57-61 parts of polyacrylic acid, 35-40 parts of ethylene diamine tetraacetic acid, 7-10 parts of rectorite, 17-21 parts of elecampane and 10-12 parts of polyethyleneimine.

As a further scheme of the invention: the early-strength polycarboxylate superplasticizer is prepared from the following raw materials in parts by weight: 59 parts of polyacrylic acid, 37 parts of ethylene diamine tetraacetic acid, 8 parts of rectorite, 19 parts of costustoot and 11 parts of polyethyleneimine.

The preparation method of the early-strength polycarboxylate superplasticizer comprises the following steps:

1) adding deionized water with the mass 10-12 times of that of polyacrylic acid, stirring for 5-10min, adding polyethyleneimine, heating to 55-60 ℃, and treating at the temperature for 30-40min to obtain polyacrylic acid mixed solution for later use;

2) grinding radix aucklandiae, sieving with 80-120 mesh sieve, adding anhydrous ethanol 8-10 times the mass of radix aucklandiae, heating to 70-75 deg.C, stirring for 20-30min, and performing ultrasonic treatment for 30-40min with ultrasonic power of 800-;

3) crushing rectorite, sieving with a 200-mesh sieve, adding ethylenediamine tetraacetic acid and deionized water with the mass 4-5 times of that of the rectorite, mixing, heating to 70-75 ℃ for ultrasonic treatment, wherein the ultrasonic power is 800-;

4) and (3) mixing the ultrasonic treatment liquid A and the ultrasonic treatment liquid B, heating to 90-95 ℃, stirring for 25-30min, filtering, taking the supernatant, adding a polyacrylic acid mixed solution, stirring at the temperature of 100-110 ℃ for 1-1.5h, and cooling to room temperature to obtain the early strength polycarboxylate superplasticizer.

The application of the early-strength polycarboxylate superplasticizer in concrete.

The addition amount of the early-strength polycarboxylate superplasticizer is 1.5-2.5% of the mass of the concrete.

The addition amount of the early-strength polycarboxylate superplasticizer is 2% of the mass of the concrete.

Compared with the prior art, the invention has the beneficial effects that:

the invention has the advantages of low dosage, good early strength effect, steel bar corrosion prevention and the like under the combined action of all raw material parts. The low shrinkage rate can effectively improve the durability of the concrete. The water reducing rate is high, the water-cement ratio can be greatly reduced, and the strength of concrete is ensured. The slump loss prevention effect is good, and the construction performance of the concrete can be well met. The mixing amount is low, the compressive strength is high, and particularly after 28 days, the compressive strength ratio of the concrete can still be kept above 170%.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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.