阅读说明：本技术 一种无机保温干粉砂浆及其制备方法 (Inorganic heat-insulating dry powder mortar and preparation method thereof ) 是由 修海 于 2019-11-05 设计创作，主要内容包括：本发明提供了一种无机保温干粉砂浆,其特征在于,按重量计,包括以下组分：石膏粉40-50份,石膏缓凝剂0.05-0.15份,碳酸钙粉10-20份,纳米陶瓷微珠10-30份,羟丙基甲基纤维素醚0.4-0.6份,乳胶粉2-4份,木质素纤维0.1-0.3份,石蜡3-5份,能够兼顾抗压强度、干密度、导热系数。(The invention provides inorganic heat-insulating dry powder mortar which is characterized by comprising the following components in parts by weight: 40-50 parts of gypsum powder, 0.05-0.15 part of gypsum retarder, 10-20 parts of calcium carbonate powder, 10-30 parts of nano ceramic microspheres, 0.4-0.6 part of hydroxypropyl methyl cellulose ether, 2-4 parts of latex powder, 0.1-0.3 part of lignin fiber and 3-5 parts of paraffin, and the compressive strength, the dry density and the heat conductivity coefficient can be considered at the same time.)

1. The inorganic heat-insulating dry powder mortar is characterized by comprising the following components in parts by weight: 40-50 parts of gypsum powder, 0.05-0.15 part of gypsum retarder, 10-20 parts of calcium carbonate powder, 10-30 parts of nano ceramic microspheres, 0.4-0.6 part of hydroxypropyl methyl cellulose ether, 2-4 parts of latex powder, 0.1-0.3 part of lignin fiber and 3-5 parts of paraffin.

2. The inorganic thermal insulation dry powder mortar of claim 1, wherein the gypsum retarder is one or more of citric acid, sodium citrate, tartaric acid, potassium tartrate, acrylic acid and sodium acrylate.

3. The inorganic thermal insulation dry powder mortar according to claim 1, wherein the calcium carbonate powder is heavy calcium carbonate powder.

4. The inorganic thermal insulation dry powder mortar of claim 1, wherein the latex powder is a re-dispersible latex powder.

5. The inorganic heat-insulating dry powder mortar of claim 1, further comprising 2-4 parts of silica gel powder.

6. A method for preparing the inorganic thermal insulation dry powder mortar of any one of claims 1 to 5, which is characterized by comprising the following steps:

s1, weighing gypsum powder, a gypsum retarder and calcium carbonate powder according to a proportion, mixing, adding into a stirrer, and stirring uniformly to obtain premix A;

s2: weighing hydroxypropyl methyl cellulose ether, latex powder, lignin fiber and paraffin according to the proportion, mixing, adding into the premix A in the step S1, and uniformly stirring in a stirrer to obtain a premix B;

s3: and adding the nano ceramic microspheres into the premix B, and uniformly stirring in a stirrer to obtain the inorganic heat-insulating dry powder mortar.

7. The preparation method of the inorganic heat-preservation dry powder mortar according to claim 6, which is characterized by comprising the following steps: in the step S1, the stirring time is 50 to 80 seconds.

8. The preparation method of the inorganic heat-preservation dry powder mortar according to claim 7, which is characterized by comprising the following steps: in the step S2, the stirring time is 2-3 min.

9. The preparation method of the inorganic heat-preservation dry powder mortar according to claim 7, which is characterized by comprising the following steps: in the step S3, the stirring time is 2-4 min.

10. The preparation method of the inorganic heat-preservation dry powder mortar according to claim 7, which is characterized by comprising the following steps: silica gel powder is also added to the premix A in step S1 in step S2, and the mixture is stirred uniformly in a stirrer.

Technical Field

The invention relates to inorganic thermal insulation dry powder mortar and a preparation method thereof, belonging to the technical field of mortar.

Background

The heat-insulating mortar is a premixed dry powder mortar prepared by mixing various light materials serving as aggregates, cement serving as a cementing material and some modified additives and stirring by a production enterprise, is mainly used for heat insulation of building exterior walls, and has the advantages of convenience in construction, good durability and the like. However, the compressive strength, dry density, thermal conductivity and the like of the existing thermal insulation mortar are difficult to be considered at the same time, and the volume shrinkage rate is difficult to reach the national standard. On the premise that the compressive strength and the dry density reach the standard, the heat conductivity coefficient is difficult to reach the standard, and the heat insulation performance is influenced.

Disclosure of Invention

The present invention provides a solution to the above problems.

The invention is realized by the following steps:

the inorganic heat-insulating dry powder mortar is characterized by comprising the following components in parts by weight: 40-50 parts of gypsum powder, 0.05-0.15 part of gypsum retarder, 10-20 parts of calcium carbonate powder, 10-30 parts of nano ceramic microspheres, 0.4-0.6 part of hydroxypropyl methyl cellulose ether, 2-4 parts of latex powder, 0.1-0.3 part of lignin fiber and 3-5 parts of paraffin.

As a further improvement, the gypsum retarder is one or more of citric acid, sodium citrate, tartaric acid, potassium tartrate, acrylic acid and sodium acrylate. The gypsum retarder slows down the setting speed of the gypsum powder, so that other raw materials are fully mixed with the gypsum powder, the interaction of the raw materials is facilitated, and the performances of the mortar, such as dry density, compressive strength, bonding strength and the like, are improved.

As a further improvement, the calcium carbonate powder is heavy calcium carbonate powder.

The nano ceramic microspheres are pitchstone vitrified microspheres or perlite vitrified microspheres and are used as main aggregates of the thermal insulation mortar, so that the thermal resistance of the material is increased, the heat conductivity coefficient is reduced, and the compressive strength of the mortar is ensured.

As a further improvement, the latex powder is a re-dispersible latex powder.

As a further improvement, the inorganic heat-preservation dry powder mortar also comprises 2-4 parts of silica gel powder. The silica gel powder has good heat preservation and insulation performance, plays a synergistic effect with the paraffin with low heat conductivity coefficient, and is matched with the gypsum powder and the nano ceramic microspheres to further reduce the heat conductivity coefficient of the material.

The preparation method of the inorganic heat-preservation dry-mixed mortar is characterized by comprising the following steps:

s1, weighing gypsum powder, a gypsum retarder and calcium carbonate powder according to a proportion, mixing, adding into a stirrer, and stirring uniformly to obtain premix A;

s2: weighing hydroxypropyl methyl cellulose ether, latex powder, lignin fiber and paraffin according to the proportion, mixing, adding into the premix A in the step S1, and uniformly stirring in a stirrer to obtain a premix B;

s3: and adding the nano ceramic microspheres into the premix B, and uniformly stirring in a stirrer to obtain the inorganic heat-insulating dry powder mortar.

As a further improvement, in the step S1, the stirring time of the stirring is 50 to 80S;

as a further improvement, in the step S2, the stirring time of the stirring is 2-3 min;

as a further improvement, in the step S3, the stirring time of the stirring is 2-4 min.

As a further improvement, silica gel powder is also added to the premix a in step S1 in step S2, and the mixture is stirred uniformly in a stirrer.

In the method, the main materials are fully and uniformly mixed in step S1, then the main materials and the auxiliary materials in step S2 are interacted, and finally the residual fine building sand is added, so that the defect that the bonding performance of the mortar is poor due to non-uniform mixing and caking of the main materials is avoided, and the bonding performance and the compressive strength of the mortar are improved. The stirring time of each step is also very critical, the stirring time in the step S1 is 50-80S, the stirring time in the step S2 is 2-3min, if the stirring time is too short, the stirring is not uniform, the adhesive property of the mortar can be reduced, if the stirring time is too long, the main material and the auxiliary material are mixed and then are dried and hardened, the interaction between the auxiliary material and the main material in the subsequent steps is not facilitated, and the performances of the mortar such as water retention property, adhesive property, compressive strength and the like are difficult to guarantee.

The invention has the beneficial effects that:

1. the inorganic heat-insulating dry powder mortar has low volume shrinkage, and the cracking rate of the corner is reduced; and the compressive strength, the dry density, the heat conductivity coefficient and the like are considered.

2. The inorganic heat-insulating dry powder mortar contains two raw materials with good heat-insulating property, namely paraffin and silica gel powder, so that the heat-insulating mortar has low heat conductivity coefficient, good heat-insulating property and good frost resistance, and can meet the standard requirement of saving energy by 50% in cold areas and hot-in-summer and cold-in-winter areas when used with different thicknesses.

3. The inorganic heat-insulating dry powder mortar has the combustion performance grade reaching A grade, is high-temperature resistant, is not easy to combust and age, and has long service life; the adhesive strength is high, and the adhesive force is strong; the compressive strength is high; can give consideration to technical indexes such as compressive strength, dry density, heat conductivity coefficient and the like.

4. The dry powder of the inorganic heat-insulating dry powder mortar can be used after being added with water and stirred on a construction site, and is convenient to construct.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of embodiments of the invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. 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.

In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.