KR0160343B1 - Cement moltar composition for water repelling and waterproofing properties - Google Patents

Abstract

As a raw material of lightweight foam concrete, silica sand powder is used as silicic acid component, and lime powder is mixed with Portland cement, lime, gypsum, and by-product ALC powder. do. The prepared ALC has a number of disadvantages in using high absorbency, which is inherent as a silicate hydrate, in the present invention, which is a silicone polymer and oligomer base material, and synthesizes an acrylic latex, which is a polymer material suitable for high-pressure hydrothermal treatment. Thus, by mixing them, it is possible to use in a reception area or a humid area by developing a high-performance water-repellent waterproof ALC by developing a water-repellent waterproofing agent that is cheaper than the currently used silicone waterproofing agent and has excellent water-repellent waterproofing property.

Particularly, among the acrylic and styrene latexes synthesized under various monomers and compositions as the polymer water repellent agent, the ratio of methyl methacrylate / butyl acrylate was 5: 5-1: 9, and the particle size of the copolymer latex was 0.1-0.2. μ and glass transition temperature (Tg) of 20 ° C-110 ° C have been found to provide water repellency best suited to the production conditions of lightweight foamed concrete.

Description

High Performance Water Repellent Waterproof Water Repellent Waterproofing Agent for Concrete Production

The present invention relates to a polymer water-repellent waterproofing agent which is added as a water-repellent waterproofing agent in the production of lightweight foamed concrete in order to prevent the durability from falling due to the high water absorbency when using the lightweight foam concrete.

As a raw material of lightweight foamed concrete, silica powder is used as silicic acid powder and lime is added to the fine powders of Portland cement and lime, gypsum and by-product ALC. It is prepared by treatment. The ALC produced is a silicate lime hydrate that causes various problems in use due to its high absorption due to porosity. Therefore, in order to reduce the absorbency of lightweight foamed concrete in foreign countries, silicone water repellent which is generally waterproof is generally used.

However, considering the economic conditions, the price of such a silicone water repellent is very difficult to use for the production of water repellent ALC.

ALC, which currently does not use a waterproofing agent, is always a problem in the residential area of ALC due to the high volume absorption rate of 35% on average. As the ALC repeats the drying and absorption process during use, problems such as mold propagation frequently occur, causing great problems in hygiene, aesthetics, and long life.

In addition, the consumption of energy also increases with the repetition of wet and dry, resulting in an increase in fuel costs.

Since ALC's waterproofing agent must withstand 13 hours of high pressure hydrothermal reaction at 180 ℃, silicone waterproofing agent is known as the only heat-resistant waterproofing agent that can withstand high temperature for a long time and can be mixed in the manufacturing process, but it is restricted in use due to its high price. to be.

In the present invention, as a polymer water repellent agent to be used for producing ALC having low cost and excellent water repellency that can be used in a reception part or a humid area, it is possible to use a mixture with a siloxane (olixane) oligomer and a polymer (water repellent agent) and high pressure hydrothermal An object of the present invention is to develop a water-repellent waterproofing agent for producing a water-repellent waterproof foamed concrete composed of a mixture of various acrylic acid, acrylic acid esters and styrene-based latex (water-repellent waterproofing aid) stable to treatment. The viscosity of the silicone water repellent agent used in the present invention is a 5-50 centistokes of siloxane (Siloxane) -based polymer and oligomer. As a water-repellent water-repellent aid polymer material to be mixed here, various acrylates, methacrylates, acrylic acid, methacrylic acid, styrene and crosslinkable monomers It is a polymer of latex state synthesized.

For example, the acrylic latex synthesis method is known as a mixture of distilled water, emulsifiers, buffers, initiators in an appropriate proportion of acrylic monomers and synthesized in a batch or semi-batch polymerization reaction at 60-90 ℃. After complete reaction, white latex is mixed with silicone waterproofing agent to make water-repellent waterproofness by complementary action in high temperature hydrothermal reaction. Polymer is evenly distributed and deposited on the surface of hydrate during hydrothermal reaction at high temperature to improve waterproofness. There is a feature of the present invention.

In general, the latex itself is very weak in water resistance, so the material of the present invention is hardly used as a water repellent, and the significance of the present invention is to significantly reduce the amount of expensive silicon material used without reducing water repellency, thereby reducing costs.

The latex polymer water repellent water-repellent aid, which is used as the main material of the silicone water repellent and mixed with it, first synthesizes the seed latex under a nitrogen atmosphere, and then the residual monomers are subjected to semi-continuous emulsion polymerization. The copolymerization latex is prepared by a polymerization reaction after the addition is completed by controlling the exotherm while adding slowly.

The polymerization reactor and polymerization auxiliary apparatus used for production of the copolymerized latex are as follows.

A four-necked round flask made of glass was used as a polymerizer, and the polymerizer was mounted on a heating mantle, and a teflon-type paddle-type pad was made at the center of the four-holes located in the upper portion of the flask. (Paddle Type), the rotational speed is controlled to about 250rpm, the other one of the condenser, the other one of the Teflon tube connected to the micro-addition pump tube for monomer addition purposes, the other one of the nitrogen injection tube and temperature A thermocouple for the regulator was mounted. Temperature control of the reactor was carried out with the temperature controller fixed at 60 ° C. and under nitrogen atmosphere over the course of the polymerization.

In order to manufacture the copolymer latex of methyl methacrylate and butyl acrylate which is one of the water-repellent aid polymer materials of this invention, it carried out as mentioned above using semi-batch polymerization reaction. After preparing the cdratex using about 10% of the monomer, polymerization was then performed while adding the remaining monomer over about 3 hours. In this semi-batch polymerization reaction, the heat of polymerization could be controlled to 80 ° C or lower throughout the entire polymerization process, and the milky white methyl methacrylate and butyl acrylate, which had almost 100% conversion of solid content and excellent colloidal stability, were used. Copolymer latex could be prepared. The particle size of the latex was 0.1-0.2 μm, and the viscosity and pH of the latex were 10-15 cps and 8-9, respectively. Latex storage stability at room temperature was good without change in appearance, viscosity and PH for at least 1 year. The monomer mixing ratio of methyl methacrylate and butyl acrylate may be widely applied, but as the amount of butyl acrylate increases, the particle size decreases and the glass transition temperature (Tg) decreases.

When the glass transition temperature (Tg) is 110 ° C or more, the glass transition temperature exists in the shape of a bead almost without deformation in the high temperature and high pressure state, which is a manufacturing condition of the foamed concrete. In this case, the softening of the resin and the melting between the particles are severe, resulting in uneven bubble size and distribution, and these phenomena lead to a decrease in water repellency of the water-repellent foamed concrete.

The use ratio of methyl methacrylate and butyl acrylate is 50: 50-10: 90, and the glass transition temperature (Tg) of the prepared polymer material is in the range of 20 ° C-100 ° C. Most preferred as a water-repellent aid.

The manufacturing method of high performance water repellent water repellent ALC is obtained by mixing silica sand, gypsum and ALC by-products with water as lime, cement, lime and silica as water, adding the above-mentioned high performance water repellent mixture, stirring it sufficiently, and adding a small amount of AL powder to foam It is prepared by hydrothermal synthesis in an autoclave of high temperature and high pressure. At this time, to improve the compressive strength, fly ash was finely divided to 4000 ㎠ / gr to increase or decrease the strength of Tobermolite mineral. Also, water-repellent ALC has less water absorption than general ALC. Since the occurrence of mold is suppressed, it is proposed as Patent Application No. 95-42203 prior to the present application to obtain a product having excellent quality.

The water-repellent waterproofing agent for producing a water-repellent waterproof foamed concrete of the present invention, as described in claim 1, the acrylate (Silxane) -based oligomer or siloxane-based polymer 0.3 to 10.0% by weight with respect to ACL, and the acrylic ester and the styrene-based in the weight ratio to ALC It is characterized by consisting of a mixture of 0.3 to 10.0% of the latex.

According to the present invention, since the surface of the latex particles is surrounded by a silicon material (siloxane-based oligomer or siloxane-based polymer), the center of the silicon particles is replaced with latex, so that the amount of silicon is reduced and coated on the outer surface of the latex. As the silicon material spreads in the ALC pores and blocks the interface, the water-repellent waterproofness is maintained as it is.

The production method of the polymer water repellent waterproofing agent for producing the high performance water repellent waterproof lightweight foam concrete of the present invention as described above will be described in detail in the following examples.

Example 1

After installing the above-described polymerizer and the auxiliary device, 112 g of Aerosol MA80 and 29.4 g of NaHCO ₃ were added to the reactor with 842.8 g of distilled water sufficiently charged with nitrogen in a 20L polymerizer, and the polymerization temperature was maintained at 60 ° C. When the temperature rises to 60 ° C., an initiator (K ₂ S ₂ O ₈ / distilled water = 23.5 / 588 in gram) dissolved in distilled water is added to the reactor. When the polymerization temperature reaches 60 ° C., 470.4 g of a monomer mixture (methyl methacrylate / butyl acrylate = 235.2 / 235.2 (50/50 Wt%)), which has been sufficiently charged with nitrogen, is added for 30 minutes. The maximum polymerization temperature by heat of polymerization during the seed polymerization process is 62.5-63.0 ° C. After the completion of the seed polymerization, 4,233.6 g of the remaining monomer mixture (methyl methacrylate / butyl acrylate = 2,116.8 / 2,116.8 ( 50 / 50Wt%)) is added to the reactor over a three hour period using a monomer tracer addition pump, where all of the monomers are polymerized over the course of the polymerization temperature to control the monomer addition rate to inhibit exothermic by monomer polymerization, The temperature is kept constant at 80 DEG C. After the addition of the monomers is completed, the post-polymerization reaction is carried out for 2 hours, at which time, the polymerization temperature drops and returns to the original polymerization temperature of 60 DEG C within 30 minutes. After the post-polymerization, 15.0 g of siloxane oligomer (Hoechest Co., BS-44) was slowly added under stirring, cooled to room temperature, filtered through a 100 mesh net to produce high performance water-repellent waterproof foamed concrete (ALC). 13,895.0 g of a water repellent mixture to be used has been prepared The physical properties of this water repellent mixture are as follows.

Viscosity = 11.2cps PH = 8.5 Tg = 20.0 ℃ Particle Diameter = 0.18㎛

Example 2

Prepared by the same method and conditions in the same apparatus as in Example 1, but for the production of seed latex, methyl methacrylate / butyl atylate = 423.4 g / 47 g (90/10 Wt%) monomer mixture followed by emulsion polymerization of methyl meth Copolymer latex was prepared by emulsion polymerization by adding a monomer mixture of acrylate / butyl acrylate = 3,810.2 g / 423 g (90/10 Wt%). Subsequently, 45.0 g of siloxane polymer or siloxane oligomer (DC200-10, manufactured by Lucky DC Silicone) was slowly added under stirring, cooled to room temperature, filtered through a 100 mesh sieve, and used for the production of high performance water repellent waterproof foamed concrete (ALC). The preparation of the water repellent mixture was terminated. The amount was 13,927 g and the physical properties of the milky water repellent mixture were as follows.

Viscosity = 12.5cps PH = 9.0 Tg = 105.2 ℃ Particle Diameter = 0.22㎛

The physical properties of the copolymerized latex prepared in the above examples, respectively, the viscosity is Zahn Cup Viscometer No. 1 and Tg were measured by differential scanning calorimerter (DSC), and the particle diameter was measured by a sub-micron particle size analyzer (Nicomp-370C).

An example of the use of ALC preparation using the acrylate copolymerized latex prepared in Example was as follows.

[Example 1]

The volume absorption ratio of ALC prepared by adding 0.9% of a water-repellent agent alkyl polysiloxane and 0.6% of a water-repellent agent acryl-based latex water repellent agent was 0.6% by weight of ALC based water repellent agent, 7.14%, It had a compressive strength of 32.02 kg / cm 2 and a standard dry specific gravity of 0.535, and the main product phase was tobermolite.

[Example 2]

The volume absorption of ALC prepared by adding 1% of crushed water-repellent mixture consisting of 0.9% dimethyl siloxane polymer and 0.6% acrylic latex in a weight ratio based on ALC was 2.82%, compressive strength 49.92㎏ / ㎠, The standard dry specific gravity was 0.582 and the main product phase was tober morlite.

The water-repellent polymer mixture of the present invention is a silicone water-repellent waterproofing agent which is generally added and used in the production of lightweight foam concrete, because the water-repellent polymer mixture of the present invention has a very low water-repellent waterproof but very low-cost latex particle surface coated with a silicone material having excellent water repellency. As it can be provided at a much lower price, it not only lowers the manufacturing cost of water-repellent lightweight foamed concrete, but also provides high performance water-repellent waterproofing to prevent aesthetic and sanitary damage of lightweight foamed concrete and to solve problems such as energy loss due to moisture. It is effective.

Claims (2)

It is composed of 0.3-10.0% of siloxane oligomer or siloxane polymer in weight ratio of ALC, and 0.3-10.0% of latex in which acrylate ester and styrene are synthesized in weight ratio of ALC. A water-repellent waterproofing agent for producing a water-repellent waterproof lightweight foam concrete, characterized in that it is added to. The water-repellent waterproofing agent for producing water-repellent waterproof lightweight foam concrete according to claim 1, wherein the latex has a glass transition temperature of 20 to 110 ° C.