CN106893483A - A kind of organosilicon concrete protection emulsion and preparation method thereof - Google Patents

Abstract

The invention relates to a building coating, in particular to an organic silicon concrete protective emulsion and a preparation method thereof. The technical scheme of the present invention is as follows: a silicone concrete protective emulsion, comprising silicone oil, emulsifier and water, its mass ratio is: 10-12 parts of silicone oil, 7-8 parts of emulsifier, and 82-83 parts of water; The emulsifier is a combination of two surfactants formulated as: Span‑80+OP‑10, Tween‑60+Span‑60 or Tween‑60+Span‑80. The organosilicon concrete protective emulsion provided by the invention can improve the water resistance of the concrete after being applied to the concrete structure, and especially can improve the resistance of road and bridge concrete to corrosion by deicing salt.

Description

A kind of organosilicon concrete protective emulsion and preparation method thereof

technical field

The present invention relates to an architectural coating, in particular to a silicone concrete protective emulsion and a preparation method thereof.

Background technique

With the increasing application range of concrete structures, the durability of concrete structures in harsh environments has gradually attracted people's attention. In the cold areas of our country, there are many rainy and snowy weathers in winter. In order to ensure the smooth flow of roads, a large amount of deicing salt is often put on bridges and tunnels. The use of deicing salt will cause the concrete structure in this area to be corroded by salt, especially the infiltration of a large amount of chloride ions. As a result, the internal structure and structure of cement concrete are changed, and the service performance and durability of concrete are seriously affected under the action of freeze-thaw cycles. The surface protective layer of concrete structures is peeled and peeled off in large areas, and the internal steel bars are exposed and corrosion is accelerated. Applying a protective coating on the concrete surface is an effective means to prevent the penetration of deicing salt solution. In engineering, epoxy resin, polyurethane resin, fluorocarbon resin and other materials are often used to form a dense flexible protective film with a certain thickness on the surface of the concrete structure. Prevent the penetration of harmful solutions. This type of coating requires a high degree of dryness inside the concrete before construction, because while preventing the aqueous solution from entering the concrete, the moisture inside the concrete cannot be eliminated, which will easily cause the coating to bulge, and even form parallel coatings on the shallow surface of the concrete. Frost swelling layer on the surface, resulting in damage to the concrete structure.

The particle size of silicone concrete protective emulsion is less than 0.15 μm, and the appearance is translucent to transparent, which is a state between emulsion and solution, which can make up for the lack of stability of silicone emulsion and has good storage stability and excellent permeability. The silicone material forms a certain depth of penetration layer through the capillary pores on the concrete surface, and the polycondensation of organic silicon on the surface of the concrete capillary pores in the permeation layer forms a hydrophobic film, which makes the concrete surface breathable and impermeable, and is an ideal material for concrete surface protection.

Contents of the invention

The invention provides an organosilicon concrete protective emulsion, which can improve the water resistance of the concrete after being painted on the concrete structure, and especially can improve the corrosion resistance of the concrete of roads and bridges against deicing salt.

Technical scheme of the present invention is as follows:

A silicone concrete protective emulsion, comprising silicone oil, an emulsifier and water, the mass ratio of which is: 10-12 parts of silicone oil, 7-8 parts of emulsifier, and 82-83 parts of water; the emulsifier is two kinds of surfactant The composition of agent, described surfactant is sorbitan monooleate (Span-80), sorbitan fatty acid ester (OP-10), sorbitan monostearate (Span -60) or polyoxyethylene sorbitan monostearate (Tween-60), its formula is: Span-80+OP-10, Tween-60+Span-60 or Tween-60+Span-80.

The preferred version of the silicone concrete protective emulsion is that the silicone oil is dimethyl silicone oil, its HLB value is 10.5, and its viscosity is 500cs.

The preferred version of the silicone concrete protective emulsion is that the mass ratio of the emulsifier is: Span-80:OP-10=19:31, Tween-60:Span-60=43:57, Tween- 60: Span-80 = 41:59.

The preferred version of the silicone concrete protective emulsion is that the HLB value of Span-80 is 4.1, the HLB value of OP-10 is 14.5, the HLB value of Span-60 is 4.7, and the HLB value of Tween-60 is 14.9.

A preparation method of the above-mentioned organosilicon concrete protective emulsion, comprising the following steps: first, at normal temperature, successively weigh silicone oil and emulsifier according to the mass ratio and add them to a conical flask, stir slowly, and make the emulsifier and silicone oil Mix evenly, turn on the power of the mixer, slowly add the measured water into the conical flask under the stirring state, and form a W/O emulsion at the beginning, continue to add water and stir until a slightly blue luster O/W emulsion is formed. Silicone concrete protective emulsion.

The beneficial effects of the present invention are: the organosilicon concrete protective emulsion of the present invention has good static stability and centrifugal stability, and can effectively improve the durability of the concrete structure after being painted.

detailed description

The present invention is further described below in conjunction with the examples; it should be understood that these examples are only used to illustrate the present invention, rather than limit the scope of the present invention.

Example 1

The raw materials are as follows:

The silicone concrete protective emulsion is still stable without oil slick after standing at room temperature for 24 hours, and the emulsion does not separate after being centrifuged at a speed of 2500r/min for 20 minutes in a centrifuge. After painting on the C50 concrete test block, the relative dynamic elastic modulus loss rate is 4.3% and the mass loss rate is 1.02% measured after the single-sided salt freezing test; the water absorption rate is 0.57% after the waterproof test; After the anti-chloride ion penetration test, the electric flux value was measured to be 675.68 coulombs.

Example 2

The raw materials are as follows:

The silicone concrete protective emulsion is still stable without oil slick after standing at room temperature for 24 hours, and the emulsion does not separate after being centrifuged at a speed of 2500r/min for 20 minutes in a centrifuge. After painting on the C50 concrete test block, the relative dynamic elastic modulus loss rate is 5.9% and the mass loss rate is 0.97% measured after the single-sided salt freezing test; the water absorption rate is 0.79% after the waterproof test; After the anti-chloride ion penetration test, the electric flux value was measured to be 747.28 coulombs.

Example 3

The raw materials are as follows:

The silicone concrete protective emulsion is still stable without oil slick after standing at room temperature for 24 hours, and the emulsion does not separate after being centrifuged at a speed of 2500r/min for 20 minutes in a centrifuge. After painting on the C50 concrete test block, the relative dynamic elastic modulus loss rate is 7.44% and the mass loss rate is 1.08% measured after the single-sided salt freezing test; the water absorption rate is 0.72% after the waterproof test; After the chloride ion penetration test, the electric flux value was measured to be 708.20 coulombs.

Claims (5)

1. a kind of organosilicon concrete protection emulsion, it is characterised in that including silicone oil, emulsifying agent and water, its quality proportioning is：Silicon It is oily 10-12 parts, emulsifying agent 7-8 parts, water 82-83 parts；The emulsifying agent is two kinds of compositions of surfactant, and its formula is： Span-80/OP-10, Tween-60/Span-60 or Tween-60/Span-80.

2. organosilicon concrete protection emulsion according to claim 1, it is characterised in that the silicone oil is dimethyl-silicon Oil, its HLB value is 10.5, and viscosity is 500cs.

3. organosilicon concrete protection emulsion according to claim 1, it is characterised in that the quality proportioning of the emulsifying agent For：Span-80：OP-10=19:31, Tween-60：Span-60=43:57, Tween-60：Span-80=41:59.

4. organosilicon concrete protection emulsion according to claim 1, it is characterised in that the HLB value of Span-80 is 4.1, The HLB value of OP-10 is 14.9 for the HLB value that the HLB value of 14.5, Span-60 is 4.7, Tween-60.

5. a kind of preparation method of organosilicon concrete protection emulsion as described in one of Claims 1 to 4, including following step Suddenly：First under normal temperature state, silicone oil is weighed successively by quality proportioning and emulsifying agent is added in conical flask, be slowly stirred, Make emulsifying agent and silicone oil well mixed, start stirring electromechanical source, the water that will be measured under stirring is slowly added into taper In bottle, the initial stage forms W/O emulsions, continues the stirring that adds water, and to the O/W emulsions for forming bit bluish gloss, is made organosilicon coagulation Native protection emulsion.