CN105036601B - Dry-mixed mortar dust-proof agent and dry-mixed mortar containing same - Google Patents

Abstract

The invention provides a dry powder mortar dustproof agent which can reduce the dust generated during the production, transportation and use of dry powder mortar. 15% bentonite is pre-stirred and mixed evenly, and then 10-30% silicone oil is evenly sprayed into the mixture while stirring, and the fiber is obtained by crushing natural wood chips, straw or straw into 0.1-0.5mm fines, It is then soaked in hot water at 90-100°C for 2 hours and then filtered and dried. The dustproof agent of the present invention has low cost and less addition amount, not only can well absorb the dust produced by other raw materials of dry powder mortar, effectively reduce the dust in the production and construction process of dry powder mortar, but also can form a network structure in the process of mortar hardening , greatly reducing cracking during mortar hardening. The present invention also provides a dry powder mortar containing the above-mentioned dustproof agent, the mortar includes 12%-40% inorganic gelling material, 60%-85% aggregate, 0.8-2.0% additive and 0.6-0.8% dustproof agent.

Description

A dry powder mortar dustproof agent and dry powder mortar containing the dustproof agent

technical field

The invention relates to an additive for building materials, in particular to an additive capable of reducing the dust of building materials, and more particularly to a dry powder mortar dustproof agent capable of reducing dust generated during the production, transportation and use of dry powder mortar. The invention also relates to a dry powder mortar containing the dustproof agent.

Background technique

Dry-mixed mortar is usually called hydraulic cement mixed mortar, which refers to aggregates (such as quartz sand, heavy calcium, fly ash), inorganic cementitious materials (such as cement, gypsum, lime calcium) and additives ( Such as rubber powder, cellulose ether), etc., which are physically mixed in a certain proportion in a granular or powder form, transported to the construction site in the form of bags or in bulk, and can be used directly after mixing with water. Since the raw materials and products of dry powder mortar have relatively large dust, a large amount of dust will be generated during production, transportation and use, which will have a serious impact on human health. The mixing area is equipped with dust removal equipment, but this equipment can only reduce the dust generated during the mixing process, and it is still unable to solve the large amount of dust generated during the transportation and use, especially the initial pouring and mixing of dry powder mortar, and these dusts will Seriously affect the quality of the air and the physical and mental health of operating workers.

Contents of the invention

In order to solve the above problems, the purpose of the present invention is to provide a dry powder mortar dustproof agent that can reduce the dust generated in the production, transportation and use of dry powder mortar, and the dustproof agent can also reduce the dry powder mortar during the hardening process. of cracking.

Another object of the present invention is to provide a dry-mixed mortar containing the above dust-absorbing agent.

In order to achieve the above object, the dustproof agent for dry powder mortar of the present invention is to use a dry powder mixer to pre-stir and mix 55-85% fiber and 5-15% bentonite by weight, and then mix 10-30% bentonite while stirring. % silicone oil is evenly sprayed into the mixture; the fiber is obtained by crushing natural wood chips, straw or straw into 0.1-0.5mm fines, soaking in hot water at 90-100°C for 2 hours, then filtering and drying .

The above-mentioned silicone oil is preferably methyl silicone oil or amino-modified silicone oil.

The above-mentioned bentonite is preferably sodium-based or calcium-based bentonite.

In order to fully contact the fiber with hot water so as to better remove the organic matter in the natural fiber, the above-mentioned fiber is stirred by a high-speed disperser during the process of soaking in hot water. The stirring speed is preferably 800-2000 rpm, and the stirring time is preferably 20 -30min.

The present invention also provides a kind of dry powder mortar containing above-mentioned dustproof agent, and this mortar comprises inorganic cementitious material, aggregate, additive and above-mentioned dustproof agent, and their weight percent in dry powder mortar is inorganic cementitious material 12%-40% %, aggregate 60%-85%, additive 0.8-2.0% and dustproof agent 0.6-0.8%.

The above-mentioned inorganic cementitious material is preferably cement, and the aggregate is preferably quartz sand.

The above-mentioned inorganic gelling material is preferably lime calcium, and the aggregate is preferably heavy calcium.

The above-mentioned additives are preferably cellulose ether and redispersible rubber powder, and their weight percentages in the dry powder mortar are 0.3%-0.4% of cellulose ether and 0.5-1.6% of redispersible rubber powder.

The dust-proof agent for dry powder mortar of the present invention is made by crushing wood chips, straw or straw with little utilization value into fine powder of a certain size, and then mixing it with a small amount of bentonite which has a good adsorption capacity for oily substances, and then evenly spraying it with mist Silicone oil, forming viscous powdery fibers, which are evenly dispersed in the dry powder mortar, can not only absorb the dust produced by other raw materials of the dry powder mortar, but also effectively reduce the dust generated during the production and construction of the dry powder mortar. Dust, and can form a network structure during the hardening of the mortar, which greatly reduces the cracking during the hardening of the mortar. The dry powder mortar dustproof agent of the present invention has low cost, less addition amount and obvious dust absorption effect, and is especially suitable for adding to dry powder mortar.

detailed description

Example 1

1. Preparation of dry powder mortar dustproof agent

(1) Grind the straw into 0.2-0.3mm pieces in a pulverizer, soak in hot water at 95°C for 2 hours, and stir for 20 minutes with a high-speed disperser with a speed of 800-2000 rpm, and then use a wire mesh Filtration and drying to obtain dry fibers;

(2) Stir the fibers obtained in step (1) with a weight component of 70% and 5% sodium-based bentonite in a mixer for 20 minutes, and then use a sprayer to spray 25% of simethicone into the mixer, and continue Stir for 20 minutes until uniform to obtain a powder dustproof agent.

2. Preparation of dry powder mortar

(1) Tile bonding mortar formula containing dustproof agent (weight ratio)

Cement 400

Quartz sand (40-140 mesh) 600

Cellulose ether 3.5

Redispersible latex powder 15

Dust Repellant 8

(2) Preparation

Add cement, quartz sand, cellulose ether, redispersible latex powder, and dustproof agent into the dry powder mortar mixer according to the above formula, and stir for 10 minutes until uniform.

3. Comparative experiment

According to the formula of tile bonding mortar mentioned above, the bonding mortar with and without dustproof agent was prepared. The test results are as follows:

Test items Adhesive mortar with added dustproofing agent Adhesive mortar without added dustproofing agent Dust generated during use 40 100 After adding 24% water to harden for 2 hours no cracking There are small cracks

The test value of the above dust is to set the amount of dust collected in a certain space during the use of the bonded mortar without dustproofing agent as 100, and then the bonded mortar added with dustproofing agent is collected in the same space during use. The amount of dust collected is compared with it to obtain a specific value.

It can be seen from the above table that the tile bonding mortar added with dustproof agent not only greatly reduces dust during use, but also does not crack during the hardening process of the mortar.

Example 2

1. Preparation of dry powder mortar dustproof agent

(1) Crush the straw into 0.1-0.2mm pieces in a pulverizer, soak in hot water at 90°C for 2 hours, and stir for 25 minutes with a high-speed disperser at a speed of 800-2000 rpm, then filter with a steel wire mesh , drying to obtain dry fibers;

(2) Stir the fibers obtained in step (1) with a weight component of 75% and 10% calcium-based bentonite in a mixer for 20 minutes, then use a sprayer to spray 15% amino silicone oil into the mixer, and continue stirring for 20 minutes until uniform, to obtain a powder dustproof agent.

2. Preparation of dry powder mortar

(1) Formula of interior wall putty powder containing dustproof agent (weight ratio)

Ash Calcium 150

Heavy calcium (325 mesh) 850

Cellulose ether 3.5

Redispersible latex powder 5

Dust Repellant 8

(2) Preparation

Add ash calcium, heavy calcium, cellulose ether, redispersible latex powder, and dustproof agent into the dry powder mortar mixer according to the above formula, and stir for 10 minutes until uniform.

3. Comparative experiment

According to the formula of the above-mentioned interior wall putty powder, the interior wall putty powder with dustproof agent added and the interior wall putty powder without dustproof agent were prepared, and the test results were as follows:

It can be seen from the above table that the interior wall putty powder added with dustproof agent not only greatly reduces the dust during use, but also does not crack during the hardening process of the mortar.

Claims (7)

1. a kind of dry powder and mortar dust-proofing agent, it is characterised in that：The dust-proofing agent is to adopt dry powder blender by components by weight percent for 55- After 85% fiber and the bentonite of 5-15% are uniformly mixed in advance, another side is stirred while the silicone oil of 10-30% is uniformly sprayed Mist is obtained in compound；Fiber is into the unqualified of 0.1-0.5mm, then in 90- by natural wood chip, Caulis et Folium Oryzae or crushed stalk Soak Jing filtering dryings after 2h in 100 DEG C of hot water to form, fiber is carried out during hot-water soak using high speed dispersor Stirring, mixing speed is 800-2000 turn/min, mixing time is 20-30min.

2. dry powder and mortar dust-proofing agent according to claim 1, it is characterised in that：The silicone oil is that methyl-silicone oil or amino change Property silicone oil.

3. dry powder and mortar dust-proofing agent according to claim 1 and 2, it is characterised in that：Described bentonite is sodio or calcium Base bentonite.

4. a kind of dry powder and mortar, including inorganic coagulation material, aggregate, additive, it is characterised in that：The dry powder and mortar also includes The arbitrary described dust-proofing agent of claim 1-3, percentage by weight of each component in dry powder and mortar is inorganic coagulation material 12%- 40%th, aggregate 60%-85%, additive 0.8-2.0% and dust-proofing agent 0.6-0.8%, above-mentioned each raw material components consumption sum is 100%.

5. dry powder and mortar according to claim 4, it is characterised in that：The inorganic coagulation material is cement, aggregate is stone Sand.

6. dry powder and mortar according to claim 4, it is characterised in that：The inorganic coagulation material is attached most importance to for grey calcium, aggregate Calcium.

7. the dry powder and mortar according to claim 5 or 6, it is characterised in that：The additive is cellulose ether and can divide again Scattered rubber powder, their percentage by weights in dry powder and mortar are cellulose ether 0.3%-0.4%, re-dispersible glue powder 0.5-1.6%.