KR20070088974A - Proportions of prepackaged waterproof coating materials using redispersible polymer powder - Google Patents

Abstract

Provided is a waterproof coating material composition which is able to be made into a one-pack material, be packaged in premix type and reduce the period for construction. A waterproof coating material composition comprises 12-30 wt% of a cement mineral-based binder; 23-70 wt% of at least one re-emulsion type powder resin for mixing cement selected from ethylene-vinyl acetate(EVA) or vinyl acetate/vinyl versatate(Va/VeoVa); and 18-47 wt% of silica. Preferably the ratio of binder, the powder resin and silica is 1 :2.5 : 1.5 by weight. Preferably the cement mineral-based binder comprises 30-47 wt% of common portland cement; 25-30 wt% of calcium aluminate cement; 3-10 wt% of anhydrous gypsum; and 25-30 wt% of expandable calcium sulfoaluminate.

Description

Proportions of Prepackaged Waterproof Coating Materials using Redispersible Polymer Powder}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polymer cement slurry coating waterproofing material incorporating a reemulsifying powder resin, and more particularly, to a coating waterproofing composition which can be premixed by being composed of one type. .

Recently, with the development of construction technology in the field of civil engineering and construction, the complex and difficult civil engineering and construction construction, which was difficult in the past, has been solved. However, in toxic waterproof construction, defects often occur, which is a big problem.

If the waterproof construction is wrong, leaks and flooding occurs in the finished civil engineering and building structures, thereby causing damage and damage to the finished structure. In response to this, conventionally, penetration waterproofing material, rubberized asphalt sheet waterproofing material, water-soluble rubberized asphalt coating film (water-based paint waterproofing) waterproofing material, vulcanized rubber (cooked rubber) sheet waterproofing material and organic solvent type rubber coating (oil-based paint waterproofing) waterproofing material, etc. Waterproof materials are used.

However, the conventional coating film waterproofing material has been used in the field because it is a two-shape consisting of a main material, a hardener and an aggregate as a binder. Therefore, the construction period was long and the handling was not easy. In addition, the polymer emulsion (dispersion or latex) film waterproofing material may freeze in winter as water is 50 ~ 60%, it was difficult to control the viscosity and fluidity.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a coating waterproofing composition which is composed of a single shape and can be premixed.

Another object of the present invention is to provide a coating waterproof material composition which can prevent the lifting phenomenon due to the very excellent adhesion on the wet base surface and moisture permeability.

In order to solve the above technical problem, the coating material waterproofing composition according to the present invention is 12-30% by weight of cement mineral binder and at least one cement selected from ethylene vinyl acetate (EVA) or vinyl acetate / vinyl acetate (Va / VeoVa). 23 to 70% by weight of re-emulsified powder resin and 18 to 47% by weight of silica sand, and in particular, the weight ratio of the binder, powder resin and silica sand is preferably 1: 2.5: 1.5.

In addition, the cement mineral binder is usually 30 to 47% by weight of Portland cement, 25 to 30% by weight of calcium aluminate cement (CAC), 3 to 10% by weight of anhydrous gypsum, expandable calcium sulfur aluminate (CSA) 25 to 30 It is preferably composed of weight percent.

In addition, the coating film waterproofing material composition of the present invention is preferably mixed with 1 to 5 parts by weight of naphtharene powder fluidizing agent, 5 to 15 parts by weight of heavy calcium carbonate, 0.1 to 1 parts by weight of lithium carbonate based on 100 parts by weight of the cement mineral binder. Do.

Further, it is more preferable that 1 to 5 parts by weight of the antifoaming agent is further mixed with respect to 100 parts by weight of the reemulsifying powder resin for cement admixture.

Hereinafter, the configuration and operation of the present invention will be described in detail.

The cement mineral binder is usually composed of Portland cement, calcium aluminate cement (CAC), anhydrous gypsum, and expandable calcium sulfur aluminate (CSA), where calcium aluminate cement (CAC) and expandable calcium sulfur aluminate ( CSA) is a special cement made by grinding a special clinker. Its basic properties are similar to that of ordinary portland cement used in existing concrete and promotes condensation and hardening. In particular, expandable calcium sulfaluminate cement (CSA) serves as an expander to prevent dry shrinkage of the coating waterproofing material.

In addition, the anhydrous gypsum is an element that balances the production of ethringite and cement hydrate.

The cement re-emulsified powder resin is composed of any one or more selected from ethylene vinyl acetate (EVA) or vinyl acetate / vinyl acetate (Va / VeoVa), the apparent specific gravity is 475 ± g / l, the particle size is max, 2 %> 400㎛, and redispersion in water shows particle size distribution of 0.3 ~ 9㎛.

In addition, it is preferable that the fluidizing agent used above uses a naphthalene type powder fluidizing agent, and the promoter uses lithium carbonate. The naphthalene powder fluidizing agent, which is the fluidizing agent, improves dispersibility of binder particles to facilitate workability in a hard state, and the lithium carbonate, which is an accelerator, promotes the hydration reaction of the binder to shorten the curing time. Indicates. The fluidizing agent and the accelerator are added as a small amount as compared to the binder, specifically, the naphtharene powder fluidizing agent is used in the range of 1 to 5 parts by weight of the binder composition, the lithium carbonate in the range of 0.1 to 1 parts by weight It is preferable. On the contrary, if the naphtharene powder fluidizing agent is added in excess of 5% by weight of the total composition of the binder, there is a problem that the curing is considerably lowered, the flow is excessive, and the strength is lowered. There is a problem that the value) becomes small and the operation is not easy.

If the lithium carbonate accelerator is also added in excess of 1% by weight of the total composition of the binder, the usable time is shortened due to a rapid acceleration reaction, and when added to less than 0.1% by weight, there is a problem in that the curing reaction is delayed.

In addition, heavier calcium carbonate is further incorporated as a filler to fill the pores between the silica sand as the extender of the re-emulsified powder resin and to improve the workability and strength.

When the amount of the aggregate is more than 40% by weight of the total composition, the strength and workability is inferior, when less than 10% by weight, there is a problem that material separation and shrinkage phenomenon occurs. In addition, when the binder is more than 20% by weight, there is a problem that the aggregate and the binder is separated by an excessive amount of the binder and shrinkage occurs, on the contrary, when less than 10% by weight, strength and durability are deteriorated.

Hereinafter, the configuration and operation of the present invention will be described in detail.

<Example 1>

31.39% by weight of re-emulsified powder resin, 4.39% by weight of Portland cement and 3.77% by weight of calcium aluminate cement (CAC), 0.63% by weight of gypsum, 3.77% by weight of expandable calcium sulfur aluminate (CSA), 18.83% by weight of silica sand, carbonic acid 1.26% by weight of calcium, 1.05% by weight of antifoaming agent, 0.38% by weight of naphthalene-based powder fluidizing agent, 0.03% of lithium carbonate and 34.52% by weight of water were prepared to prepare a coating waterproofing material, and then it was constructed at 20 ° C.

<Example 2>

34.42% by weight of re-emulsified powder resin, 4.02% by weight of ordinary Portland cement and 3.44% by weight of calcium aluminate cement (CAC), 0.57% by weight of gypsum, 3.44% by weight of expandable calcium sulfur aluminate (CSA), 17.21% by weight of silica sand, carbonic acid 1.15% by weight of calcium, 0.96% by weight of antifoaming agent, 0.34% by weight of naphthalene-based powder fluidizing agent, 0.02% of lithium carbonate and 34.42% by weight of water were prepared to prepare a coating waterproofing material, and then it was constructed at 20 ° C.

Comparative Example 1

0% by weight re-emulsified powder resin, 8.11% by weight Portland cement and 6.95% by weight calcium aluminate cement (CAC), 1.16% by weight anhydrous gypsum, 6.95% by weight expandable calcium sulfur aluminate (CSA), 34.76% by weight silica sand, carbonic acid 2.32 wt% of calcium, 1.93 wt% of antifoaming agent, 0.7 wt% of naphthalene-based powder fluidizing agent, 0.05% of lithium carbonate and 37.08 wt% of water were prepared to prepare a coating waterproofing material, and then it was constructed at 20 ° C.

Comparative Example 2

20.04% by weight re-emulsified powder resin, 7.01% by weight Portland cement and 6.01% by weight calcium aluminate cement (CAC), 1.0% by weight anhydrous gypsum, 6.01% by weight expandable calcium sulfur aluminate (CSA), 30.06% by weight silica sand, carbonic acid 2.0 wt% of calcium, 0.67 wt% of antifoaming agent, 0.60 wt% of naphthalene-based powder fluidizing agent, 0.04% of lithium carbonate and 26.55 wt% of water were prepared to prepare a coating waterproofing material, and then it was constructed at 20 ° C.

The compositions of Examples 1 to 2 and Comparative Examples 1 to 2 are shown in Table 1 below.

In Example 1, the coating waterproofing material was manufactured at 20 ° C. in the experimental environment, and the adhesive strength, tensile strength, and tear strength were superior to the reference values, and the workability was also excellent.

In Example 2, the coating waterproofing material was manufactured at 20 ° C. in the test environment, and the adhesion strength, tensile strength, and tear strength were superior to the reference values, and the workability was also excellent.

Comparative Example 1 was not mixed with re-emulsified powder resin, the adhesion strength, tensile strength, tear strength was less than the standard value showed a lot of cracking occurs.

Comparative Example 2 used less re-emulsified powder resin, but showed less than the standard value except workability.

According to the present invention, since the coating film waterproofing composition is composed of one type and can be premixed, the construction period can be shortened and easy to handle.

In addition, since the adhesion on the wet base surface is very excellent and the moisture permeability, there is an effect that can prevent the lifting phenomenon.

In addition, workability is good, and there is an effect to thin the finish thickness including the waterproof layer.

In addition, the coating waterproof according to the present invention is excellent in chemical resistance, adhesiveness and weather resistance because the cement mineral system, which is the main component of the binder, is excellent in corrosion resistance.

Claims (7)

12 to 30% by weight of cement mineral binder, 23 to 70% by weight of re-emulsified powder resin for cement admixture, selected from ethylene vinyl acetate (EVA) or vinyl acetate / vinyl acetate (Va / VeoVa); A coating film waterproofing composition comprising 47% by weight. The method of claim 1, The weight ratio of the binder, the powdered resin and the silica sand is 1: 2.5: 1.5 coating composition, characterized in that the. The method of claim 1, The cement mineral binders are usually 30 to 47% by weight of Portland cement, 25 to 30% by weight of calcium aluminate cement (CAC), 3 to 10% by weight of anhydrous gypsum, and 25 to 30% by weight of expandable calcium sulfur aluminate (CSA). Coating waterproofing composition, characterized in that consisting of. The method of claim 3, wherein 1 to 5 parts by weight of naphthalene powder fluidizing agent is further incorporated with respect to 100 parts by weight of the cement mineral binder. The method of claim 3, wherein The coating film waterproofing composition, characterized in that 5 to 15 parts by weight of heavy calcium carbonate is further mixed with respect to 100 parts by weight of the cement mineral binder. The method of claim 3, wherein 0.1 to 1 part by weight of lithium carbonate is further mixed with respect to 100 parts by weight of the cement mineral binder. The method of claim 1, The coating film waterproofing composition, characterized in that 1 to 5 parts by weight of the antifoaming agent is further mixed with respect to 100 parts by weight of the reemulsifying powder resin for cement admixture.