阅读说明：本技术 一种建筑材料添加剂及其制备方法 (Building material additive and preparation method thereof ) 是由 孙新坡 毕钰璋 郭毅 司马卫平 刘文方 叶建兵 张应迁 陈艳丹 郭海燕 钟言 王 于 2019-09-27 设计创作，主要内容包括：本发明公开了一种建筑材料添加剂及其制备方法,所述建筑材料添加剂包括的组分有苯丙乳液、聚乙烯醇、纤维素醚、复合钢粉渣、火山灰、可分散乳胶粉、碱激发剂、助剂,本发明提供的一种建筑材料添加剂,此建筑材料添加剂可以改善建筑材料的保水性、柔韧性和提高其粘结性,另外,还能减少建筑材料例如砂浆的摩擦,而增强了工作效能以及质量,防止抹灰层的开裂和脱落,增加附着强度和平滑性,由该配方制备得到的胶凝剂中的钢渣用量增大,矿渣用量减少。所述保湿性好的环保型建筑用胶水不会散发出有毒气体,无法危机人的安全,受到消费者的欢迎。(The invention discloses a building material additive and a preparation method thereof, wherein the building material additive comprises styrene-acrylic emulsion, polyvinyl alcohol, cellulose ether, composite steel powder slag, volcanic ash, dispersible latex powder, an alkali activator and an auxiliary agent. The environment-friendly building glue with good moisture retention can not emit toxic gas, cannot endanger the safety of the crisis, and is popular with consumers.)

1. A building material additive characterized by: comprises the components of styrene-acrylic emulsion, polyvinyl alcohol, cellulose ether, composite steel powder slag, volcanic ash, dispersible emulsion powder, alkali activator and auxiliary agent.

2. The building material additive according to claim 1, wherein: the building material additive comprises, by weight, 23-27 parts of styrene-acrylic emulsion, 16-21 parts of polyvinyl alcohol, 20-28 parts of cellulose ether, 60-80 parts of composite steel powder slag, 35-53 parts of volcanic ash, 3-7 parts of dispersible latex powder and 1.3-3 parts of an auxiliary agent.

3. The building material additive according to claim 1, wherein: the auxiliary agent comprises a ferromagnetic element, a heavy metal trapping material and an active catalytic material.

4. The building material additive according to claim 1, wherein: the polyvinyl alcohol is selected from polyvinyl alcohol with molecular weight of 70000-100000.

5. The building material additive according to claim 1, wherein: the polyvinyl alcohol is powder polyvinyl alcohol with the mesh number of 80-120.

6. The building material additive according to claim 1, wherein: the cellulose ether is hydroxypropyl methylcellulose or hydroxyethyl methylcellulose.

7. A method for preparing the building material additive according to claim 1, comprising the steps of:

(1) heating water to above 95 deg.C, and dissolving polyvinyl alcohol in water.

(2) And (2) carrying out mixed grinding treatment on the composite steel powder slag and the volcanic ash for 50-70min according to the weight ratio to obtain a dry material, adding a proper amount of water, wherein the amount of the water is 20-30% of the amount of the dry material, and stirring and uniformly mixing to obtain a mixed solution.

(3) And (3) mixing the cellulose ether, the dispersible latex powder, the alkali activator and the auxiliary agent into the mixed solution obtained in the step (2) to obtain a prepared solution.

(4) And (3) mixing the polyvinyl alcohol obtained in the step (1) and the prepared liquid obtained in the step (3) to obtain the building material additive.

8. The method for preparing the building material additive according to claim 7, wherein: the fineness standard of the building material additive is 460-520 m/kg.

Technical Field

The invention relates to the field of building materials, in particular to a building material additive and a preparation method thereof.

Background

In the field of existing building materials, steel slag and volcanic ash are used for replacing cement clinker to prepare cement cementing materials to produce mortar with stable product performance and good workability, because the chemical composition and the phase composition of the steel slag and the volcanic ash are close to the quantity of common silicon cement, the steel slag can be recycled, and the utilization rate of the steel slag is improved.

However, in the prior art, when the cement clinker is replaced by the steel powder slag, the slag and the volcanic ash, a large amount of slag powder and a small amount of steel slag powder are needed to make the mortar meet the specification, so that the utilization rate of the steel slag is low, and the actual production cost is increased.

And when the slag powder and the steel slag powder are used, the water retention of concrete is poor, however, various building materials need certain water retention and mortar with poor water retention, and the building materials are easy to bleed and segregate in the transportation and storage processes, namely, water floats on the surface, sand and cement sink on the bottom, and the building materials need to be stirred again before use.

Various base layers needing mortar for construction have certain water absorption, if the water retention of the mortar is poor, in the smearing process of the mortar, as long as the premixed mortar is in contact with the block or the base layer, the premixed mortar can absorb water, and the outer surface of the mortar evaporates water to the atmosphere, so that the mortar is insufficient in water due to dehydration, further hydration of cement is influenced, normal development of the strength of the mortar is influenced, the strength, particularly the interface strength between a mortar hardened body and the base layer is reduced, and the mortar is cracked and falls off. The mortar with good water retention property has sufficient cement hydration, can normally develop the strength and can be well bonded with the base layer.

The ready-mixed mortar is usually built among water-absorbing blocks or coated on a base layer, and forms an integral body together with a matrix. The influence of poor water retention of the mortar on the engineering quality is as follows:

1. the normal setting and hardening of the mortar are influenced due to excessive water loss of the mortar, the binding force between the mortar and an object surface is reduced, the construction operation is not convenient, the strength of the masonry is reduced, and the engineering quality is greatly reduced.

2. If the mortar has poor water retention, water is easily absorbed by the bricks, so that the mortar is too dry and thick and is not flatly coated, the progress is influenced, and the wall surface is easy to crack due to shrinkage during construction.

Therefore, the increase of the water retention of the mortar is not only beneficial to construction, but also can increase the strength.

Disclosure of Invention

The invention aims to solve the problems that the existing building material additive can not ensure the water absorption of mortar, and the utilization rate of steel slag is very low, so that the actual production cost is increased.

In order to achieve the purpose, the technical scheme of the invention is as follows:

the building material additive comprises styrene-acrylic emulsion, polyvinyl alcohol, cellulose ether, composite steel powder slag, volcanic ash, dispersible emulsion powder, alkali activator and auxiliary agent.

Further, the building material additive comprises, by weight, 23-27 parts of styrene-acrylic emulsion, 16-21 parts of polyvinyl alcohol, 20-28 parts of cellulose ether, 60-80 parts of composite steel powder slag, 35-53 parts of volcanic ash, 3-7 parts of dispersible latex powder and 1.3-3 parts of an auxiliary agent.

Further, the auxiliary agent comprises a ferromagnetic element, a heavy metal trapping material and an active catalytic material.

Further, the polyvinyl alcohol with molecular weight of 70000-100000 is selected as the polyvinyl alcohol.

Furthermore, the polyvinyl alcohol is selected from powdery polyvinyl alcohol with the mesh number of 80-120.

Further, the cellulose ether is hydroxypropyl methyl cellulose or hydroxyethyl methyl cellulose.

A preparation method of a building material additive comprises the following steps:

(1) heating water to above 95 deg.C, and dissolving polyvinyl alcohol in water.

(2) And (2) carrying out mixed grinding treatment on the composite steel powder slag and the volcanic ash for 50-70min according to the weight ratio to obtain a dry material, adding a proper amount of water, wherein the amount of the water is 20-30% of the amount of the dry material, and stirring and uniformly mixing to obtain a mixed solution.

(3) And (3) mixing the cellulose ether, the dispersible latex powder, the alkali activator and the auxiliary agent into the mixed solution obtained in the step (2) to obtain a prepared solution.

(4) And (3) mixing the polyvinyl alcohol obtained in the step (1) and the prepared liquid obtained in the step (3) to obtain the building material additive.

Further, the fineness standard of the building material additive is 460-520 m/kg.

Compared with the prior art, the invention has the advantages and positive effects that:

the building material additive provided by the invention can improve the water retention property and flexibility of a building material, improve the caking property of the building material, reduce the friction of the building material such as mortar, enhance the working efficiency and quality, prevent a plastering layer from cracking and falling, increase the adhesive strength and smoothness, increase the consumption of steel slag in a gelling agent prepared by the formula and reduce the consumption of the slag. The environment-friendly building glue with good moisture retention can not emit toxic gas, cannot endanger the safety of the crisis, and is popular with consumers.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.