JP6213910B2 - High Ca polymer solution, high Ca polymer solution manufacturing method, stucco material using high Ca polymer solution, and stucco manufacturing method - Google Patents

Description

The present invention is a high Ca polymer solution that can be suitably used for the production of stucco with excellent waterproofness and strength, a method for producing a high Ca polymer solution, a stucco material using a high Ca polymer solution, about the production how.

  Stucco is a hard-coating wall material that is applied by kneading slaked lime with fine aggregate, fibers such as hemp, adhesive obtained from herbs and seaweed, water, etc. It has characteristics such as fire resistance. Stucco having such characteristics has attracted attention as one of the countermeasures for solving the problem of formaldehyde and condensation in the house.

  For example, Patent Document 1 discloses a building board having an inorganic layer formed by drying a kneaded product containing slaked lime, bamboo, glue and water into a plate shape, and the kneaded material is 5 to 10% by weight. Architectural boards containing synthetic resins have been proposed. As the synthetic resin, water-based acrylic silicon, fluorine, modified epoxy resin, and the like are used, and the building board of the invention is said to exhibit a good humidity control action in a place where humidity is high and condensation is likely to occur.

  Patent Document 2 contains 15 to 40% by weight of slaked lime, 30 to 70% by weight of aggregate, 5 to 10% by weight of a synthetic resin binder (solid content), and 3 to 10% by weight of wheat fiber. Coating compositions have been proposed. As the synthetic resin binder, an emulsion type acrylic resin binder is preferable. And if this building paint composition is applied to the indoor wall surface, ceiling surface, outer wall surface, etc. of the building, the surface finish layer with the desired thickness will not be cracked in a single painting operation. It can be formed, and wall condensation can be effectively prevented.

  Patent Document 3 contains oyster shell powder, red shell shell powder, shell ash, diatomaceous earth, and scallop shell powder blended with slaked lime and dolomite, a thickening stabilizer as a thickening additive, a specified additive, a gum base, A stucco cream characterized in that it is obtained by blending at least one of cellulose derivatives, guar gum derivatives, bio gums, thickeners and / or combining and blending any two or more thickeners is proposed. ing. Furthermore, if acrylic resin, silicon resin, fluorine resin, etc. are added as a binder, it is said that cracking and splitting can be made difficult, and this plaster cream forms a surface finish layer as an indoor wall surface, ceiling, or outer wall It is said that it can provide a plaster having moisture absorption / release properties and adsorptivity, and having little condensation and cracking.

Japanese Patent Laid-Open No. 11-100973 Japanese Patent Laid-Open No. 2003-306614 JP 2010-37917

  As shown in Patent Documents 1 to 3, plaster added with a thickener such as a synthetic resin or a gum base that can solve the problem that the plaster tends to crack during construction while maintaining the humidity control function of the plaster. Proposed. However, when the plaster is exposed to wind and rain, attention has been paid to the problem that water penetrates into the plaster and the strength and durability are impaired, and there is no proposal to further improve the waterproofness of the plaster. In addition, there is no suggestion of stucco that can improve strength as well as waterproofness. The use of plaster can be further expanded if the waterproofness and strength of the plaster increase.

  On the other hand, the building board proposed in Patent Document 1 is said to have improved bending strength, but there is no specific description thereof. Moreover, the addition of the synthetic resin may hinder the carbon dioxide absorption of the stucco to inhibit the stucco from being cured, and may cause a decrease in strength.

In view of the such applications expand conventional problems and plaster, and an object thereof is to provide a superior lacquer Eating more waterproofness and strength than conventional plaster. Moreover, it aims at providing the stucco material which can manufacture such a stucco, the high Ca polymer solution, and its manufacturing method.

High Ca polymer solution according to the present invention is state, and are not formed by the quick lime and / or slaked lime and polymer material is dissolved in an acidic aqueous solution, the polymer material is gum arabic.

In the above invention, the acid aqueous solution may be an aqueous acetic acid solution.

  Moreover, quicklime and / or slaked lime can be obtained by firing oyster shells at 900 to 1200 ° C.

  In addition, the high Ca polymer solution according to the present invention includes the polymer material is gum arabic powder, the acidic aqueous solution is an acetic acid aqueous solution, and 1.0% to 3.0% quick lime and / or slaked lime is added to the acetic acid aqueous solution at a weight percentage concentration. The rubber powder can be dissolved in an amount of 0.5 to 3.5%.

  By using quick lime and / or slaked lime and fine aggregate as main components and adding the high Ca polymer solution, a plaster material suitable for plaster can be formed.

  The manufacturing method of the stucco according to the present invention is carried out by kneading the stucco material mainly composed of quick lime and / or slaked lime and fine aggregates and the high Ca polymer solution, and is excellent in waterproofness and strength. Plaster can be applied.

Using the manufacturing method of the high Ca polymer solution according to the present invention, quick lime and / or slaked lime powder and a high concentration of high-Ca obtained Ri by that a powder of a polymer material is stirred and added simultaneously to an aqueous acidic solution The polymer solution is diluted with an acidic aqueous solution, and this high-concentration high-Ca polymer solution is mixed with an acidic aqueous solution in which a predetermined amount of quicklime and / or slaked lime powder is dissolved, or this high-concentration high-Ca A high Ca polymer solution in which the Ca and / or polymer concentration is adjusted can be produced by mixing the molecular solution and an acidic aqueous solution in which a predetermined amount of the polymer material powder is dissolved.

  According to the present invention, plaster excellent in waterproofness and strength can be applied. If the high Ca polymer solution according to the present invention is used, a plaster excellent in waterproofness and strength can be suitably produced.

It is a graph which shows the result of the water absorption test of the stucco using the high Ca polymer solution which concerns on this invention. It is a graph which shows the bending test result of the plaster using the high Ca polymer solution which concerns on this invention. It is a graph which shows the compression test result of the stucco using the high Ca polymer solution which concerns on this invention. It is a schematic diagram which shows the structure of the stucco wall using the stucco which concerns on this invention. It is a graph which shows the change state of the water absorption rate of the first seven days of the various test pieces in a water absorption test. It is explanatory drawing which shows the neutralization test result using the high Ca polymer solution which concerns on this invention. It is explanatory drawing which shows the neutralization test result of normal plaster. It is a graph which shows the shrinkage amount of the stucco using the high Ca polymer solution which concerns on this invention. It is a graph which shows the weight decreasing rate of the stucco using the high Ca polymer solution which concerns on this invention. It is explanatory drawing which shows the test method of the proof stress test of a stucco wall. It is a graph which shows the result of a proof stress test.

  Hereinafter, modes for carrying out the present invention will be described. The present invention relates to a stucco material, and includes quick lime and / or slaked lime as a main component, and a polymer solution containing high Ca in a fine aggregate. That is, the stucco material according to the present invention is characterized by including a polymer solution containing a large amount of Ca component. This high Ca polymer solution is obtained by dissolving quick lime and / or slaked lime and a polymer material in an acidic aqueous solution.

  Containing a large amount of the Ca component means that the Ca component is contained in the solution, for example, in a weight percentage concentration of 1.0 to 3.0%. That is, Ca is generally dissolved in pure water by about 0.2% (for example, http://www.takenet-eco.co.jp/pages/jitsurei/sokai_senjo.html, http://www.questions.gr .jp / chem / odoroki1.htm), a solution containing a Ca component at a concentration that is an order of magnitude higher than the dissolved concentration of pure water is called a high Ca solution.

  The polymer solution refers to a solution containing, for example, 0.5 to 3.5% polymer material at a weight percentage concentration. In the present invention, the polymer material is preferably one that improves the waterproofness of the plaster without hindering the characteristics of the plaster as a natural material. Especially, what does not inhibit the neutralization promotion effect and strength improvement effect by the Ca component demonstrated below is preferable.

  The high Ca polymer solution is prepared by simultaneously adding and stirring quick lime and / or slaked lime powder and polymer material powder to the acidic aqueous solution, and dissolving Ca and the polymer material in the acidic aqueous solution. Quick lime and / or slaked lime are not limited to specific quick lime and / or slaked lime, and oyster shell powder baked at 900 to 1200 ° C. can be used. Instead of oyster shells, other shells can be fired and used.

  For example, gum arabic can be suitably used as the polymer material. The gum arabic that can be used here is not limited to a specific gum arabic. An acetic acid aqueous solution can be used as the acidic aqueous solution. For example, when a 10% aqueous acetic acid solution is used, a high Ca polymer solution in which the Ca component is dissolved in a weight percentage concentration of 1.0 to 3.0% and the polymer material is dissolved in an amount of 0.5 to 3.5% can be obtained.

  In the production of a high Ca polymer solution, it is preferable that quick lime and / or slaked lime powder and polymer material powder are simultaneously added to an acidic aqueous solution and dissolved by stirring. In order to add the quicklime and / or slaked lime powder and the polymer material powder at the same time, a predetermined amount of quicklime and / or slaked lime powder and the polymer material powder are mixed in advance, and the mixed powder is made into an acidic aqueous solution. What is necessary is just to add. The acidic aqueous solution is preferably a 10% aqueous acetic acid solution. A high Ca polymer solution having a desired Ca concentration or polymer concentration is prepared by first preparing a high Ca polymer solution having a high concentration by the above method and diluting it with an acidic aqueous solution. Mixing a molecular solution with an acidic aqueous solution in which a predetermined amount of quicklime and / or slaked lime powder is dissolved, or an acidic aqueous solution in which this high concentration high Ca polymer solution and a predetermined amount of polymer material powder are dissolved It is good to produce by mixing. In addition, the addition to acidic aqueous solutions, such as quicklime, is good to add a fixed ratio of quicklime and / or slaked lime powder and polymer material powder to the acidic aqueous solution prepared beforehand. It is convenient to quantitatively supply the powder of quick lime and / or slaked lime and the powder of the polymer material using separate quantitative supply devices.

  In the production of a high Ca polymer solution, after adding quick lime and / or slaked lime powder to an acidic aqueous solution, a method of adding a polymer material powder, or after adding a polymer material powder of quick lime and / or slaked lime In the method of adding powder, or the method of adding quick lime and / or slaked lime powder and polymer material powder alternately, a desired high Ca polymer solution cannot be obtained.

  After the quick lime and / or slaked lime powder and the polymer material powder are added to the acetic acid aqueous solution, it is good to stir well. In the production experiment of the high Ca polymer solution, when the oyster shell powder and the gum arabic powder were added simultaneously to the acetic acid solution, intense foaming was observed for several hours, and both were observed to react. By aging the acetic acid aqueous solution for a whole day and night, a defoamed high Ca polymer solution could be obtained. However, when the oyster shell powder and the gum arabic powder were separately added to the acetic acid solution, the above reaction was not observed, and the oyster shell powder and the gum arabic powder were not sufficiently dissolved in the acetic acid solution.

  Moreover, in order to obtain a high Ca polymer solution having a predetermined Ca concentration and polymer material concentration, a method of diluting a high Ca polymer solution having a certain concentration with water is not preferable. For example, after preparing a high Ca polymer solution with a calcium concentration of 2.5% and a polymer concentration of 3.5% by weight percentage concentration, the same amount of water is added to the high Ca polymer solution and diluted to achieve a weight percent concentration. A high Ca polymer solution having a Ca concentration of 1.25% and a polymer material concentration of 1.75% can be obtained. However, the plaster using the high Ca polymer solution obtained by such a method does not exhibit the desired performance. When diluting, it is important to use an acidic aqueous solution instead of water as shown in the above-mentioned production procedure of the high Ca polymer solution.

  The stucco material which concerns on this invention adds the said high Ca polymer solution to quicklime and / or slaked lime, and a fine aggregate, and can add the sand and the adhesive agent generally added to stucco. Although the fine aggregate is not particularly limited, mountain sand, river sand, lime sand and the like can be used. Moreover, the stucco according to the present invention is manufactured by kneading and coating the stucco material. The plaster according to the present invention is excellent in waterproofness and has high strength.

  This stucco material may be prepared by separately stocking components such as quick lime and fine aggregate and high Ca polymer solution, and kneading them at the time of use. What added components, such as material, and a high Ca polymer solution may be used. In addition, what added components, such as quick lime and a fine aggregate, and a high Ca polymer solution previously, is airtightly packed and stored, and is used after re-kneading at the time of use.

  FIG. 1 shows the results of making a stucco test piece using the high Ca polymer solution shown in the Examples and conducting a water absorption test. The horizontal axis represents the concentration of the polymer material dissolved in the high Ca polymer solution, and is the weight ratio of the polymer material (gum arabic) to the acidic aqueous solution (acetic acid aqueous solution). In FIG. 1, for example, Po3.0 is 3.0% by weight of the polymer material (gum arabic) with respect to the acidic aqueous solution (acetic acid aqueous solution), and the weight of the polymer material dissolved in the high Ca polymer solution. Expressed as a percentage concentration, it is 2.9%. The Ca concentration as a parameter is also the Ca concentration dissolved in the high Ca polymer solution, and is the weight ratio of Ca (calcined oyster shell) to the acidic aqueous solution (acetic acid aqueous solution). The polymer concentration (Po concentration) and Ca concentration described below represent the weight ratio of the polymer material (gum arabic) or Ca to the acidic aqueous solution (acetic acid aqueous solution) unless otherwise specified as the weight percentage concentration.

  The vertical axis represents the moisture absorption rate. In FIG. 1, for example, Po1.0 indicates a result of water absorption test of a stucco test piece having a polymer concentration of 1.0% and a Ca concentration of 1.5%, 2.0%, and 2.5%, respectively. % Indicates a water absorption rate with a Ca concentration of 1.5%. The bar graph shows the average value of the water absorption rate of each test piece having a polymer concentration of 1.0% and a Ca concentration of 1.5%, 2.0% and 2.5%. Po0 indicates the water absorption rate of ordinary plaster (a plaster prepared using pure water instead of a high Ca polymer solution). The water absorption rate is a percentage by weight of the water absorption amount of the stucco test piece with respect to the initial test piece.

  According to FIG. 1, it can be seen that the moisture absorption rate can be lowered by the inclusion of the polymer material, and the waterproofness of the stucco can be improved. However, it can be seen that there is an appropriate polymer concentration, and in this example, the polymer concentration is preferably around 2.0%. Incidentally, the water absorption rate of the polymer concentration of 3.0% is higher than that of the polymer concentration of 2.0% in the average value, but when observed together with the variation of the water absorption rate of the test pieces having different Ca concentrations, A polymer having a polymer concentration of 3.0% may not be said to have deteriorated in water resistance as the average value shows as compared with a polymer concentration of 2.0%.

  Also, according to FIG. 1, it can be seen that when the Ca concentration is 2.0%, the water absorption rate is inversely proportional to the polymer concentration, and the water absorption rate decreases as the polymer concentration increases. It can also be seen that when the Ca concentration is 2.5%, the water absorption rate can be stably lowered in the range where the polymer concentration is 1.0% to 3.0%. On the other hand, when the Ca concentration is 1.5%, the water absorption rate is abnormally high when the polymer concentration is 3.0%, but the water absorption rate is stable when the polymer concentration is in the range of 1.0% to 2.0%. It can be seen that it can be lowered.

  FIG. 2 or FIG. 3 shows the result of producing a stucco test piece using the high Ca polymer solution shown in the Examples and performing a bending test or a compression test. In FIG. 2, the horizontal axis indicates the polymer concentration in the high Ca polymer solution, and the vertical axis indicates the bending stress degree. An asterisk indicates the bending stress level of ordinary plaster. The parameter is the Ca concentration. In FIG. 3, the horizontal axis indicates the polymer concentration in the high Ca polymer solution, and the vertical axis indicates the degree of compressive stress. The asterisk indicates the compressive stress level of ordinary plaster. The parameter is the Ca concentration.

  According to FIG. 2, it can be seen that the stucco produced using the high Ca polymer solution can increase the bending strength several times as much as the normal stucco. In addition, when the Ca concentration is 1.5% or 2.0%, the bending strength is high when the polymer concentration is 1.0% or less. However, when the polymer concentration exceeds 1.0%, the bending strength decreases rapidly. It can be seen that the bending strength is equal to or less than that of plaster. On the other hand, when the Ca concentration is 2.5%, it can be seen that the bending strength is high with almost no influence on the polymer concentration.

  According to FIG. 3, it can be seen that the plaster produced using the high Ca polymer solution can increase the compressive strength several times or more than that of ordinary plaster. It can also be seen that the compressive strength is hardly affected by the polymer concentration when the Ca concentration is in the range of 1.5 to 2.5%. In particular, when the Ca concentration is 2.0%, it can be seen that there is little variation in the degree of compressive stress due to the difference in polymer concentration, and the degree of compressive stress is high.

  The high Ca polymer solution according to the present invention and the stucco using this high Ca polymer solution have been described above. The plaster according to the present invention is excellent in waterproofness and has high strength. For this reason, the stucco wall which has high intensity | strength while being excellent in waterproofness as shown, for example in FIG. That is, it is possible to prepare a building outer wall made of plaster by applying an undercoat with a plaster 3 according to the present invention to a wooden Komai panel 1 and applying an intermediate coat 5 and an overcoat 7. In this case, it is also possible to omit a moisture-permeable waterproof sheet or asphalt roofing that is generally provided in the lowermost layer. The plaster according to the present invention is excellent in waterproofness and has high strength, and therefore may be used as an intermediate coating material. In this case, since the plaster according to the present invention is slightly yellowish, it is preferable to overcoat the white plaster. As the coating base, in addition to the wooden Komai panel, a wood slide, a wood cement board, concrete, or the like can be used. In the case where the coating base is a wooden Komai panel or a wood slide, in the plaster according to the present invention, the periphery of the xylem can be made an alkaline ground, so that a highly preservative plaster wall can be produced.

  A plaster test piece was prepared using the high Ca polymer solution according to the present invention, and a water absorption test, a weight and dimension measurement test, a neutralization test, and a strength test were performed. First, the high Ca polymer solution was prepared as follows. An acetic acid aqueous solution (10% concentration) in which 100 g of acetic acid (first grade manufactured by Wako Pure Chemical Industries, Ltd., Code No.014-00266) is added to 900 g of pure water, and a powder place obtained by baking oyster shells at 1200 ° C A predetermined amount of powdered gum arabic (manufactured by Yamada Pharmaceutical Co., Ltd .: CHEMICAL INDUSTRIAL gum arabic) was mixed in advance and mixed powder was prepared. For example, when producing a high Ca polymer solution having a Ca concentration of 2.0% and a polymer concentration of 3.0%, a mixed powder prepared by thoroughly stirring 20 g of oyster shells fired at 1200 ° C. and 30 g of gum arabic powder is prepared. Table 1 shows the component analysis results of the white powder obtained by baking oyster shells at 1200 ° C. The mixed powder was added to the acetic acid aqueous solution in several portions and stirred well. The acetic acid aqueous solution was allowed to stand for a whole day and night to obtain a high Ca polymer solution. High Ca polymer solutions were prepared with gum arabic concentrations of 0.5-3.5% and Ca concentrations of 1.5, 2.0, 2.5%.

  A stucco test piece was prepared as follows using the high Ca polymer solution. Quick lime, fine aggregate, and high Ca polymer solution are mixed with a stucco material with a mass ratio of 1: 3.58: 1.2 to produce a stucco, and this stucco is driven into a formwork of 40 x 40 x 160 (mm) A prismatic plaster specimen was prepared. The quicklime used was made by Nakayama Lime Industry Co., Ltd. The fine aggregate used was 2.5mm sieve of Chinese mountain sand. The preparation, strength test, and neutralization test of the stucco test body were performed in accordance with JIS A1171 (Testing method for polymer cement mortar). Curing was done by air curing. The period of water absorption test, weight and dimension measurement test was 168 days, and the period of neutralization test was 6 months. For comparison, a plaster (ordinary plaster) test piece using pure water instead of the high Ca polymer solution was also prepared.

  The water absorption test was performed by curing the prepared plaster test piece for 28 days, and then allowing the test specimen to be immersed in water by about 10 mm in a plastic container and measuring the weight. FIG. 5 shows the change in water absorption rate over 7 days for various test pieces. The horizontal axis represents the number of days elapsed, and the vertical axis represents the moisture absorption rate. As shown in FIG. 5, the moisture absorption rate shows a substantially constant value after 2 days from the start of the test. The graph shown in FIG. 1 shows the average moisture absorption rate for 168 days after the moisture absorption rate becomes a substantially constant value.

  For the strength test, a bending strength test and a compressive strength test were performed. The bending strength test and the compressive strength test were performed on the stucco test piece after curing for 28 days. The test results are shown in FIGS. 2 and 3 described above.

  6 and 7 show the results of the neutralization test. FIG. 6 is an explanatory diagram showing the neutralization test results of a plaster test piece prepared using a high Ca polymer solution having a Ca concentration of 2.5% and an gum arabic concentration of 2.0%. FIG. 7 is an explanatory view showing the neutralization test result of a test piece using ordinary plaster.

  According to FIG. 6, it is observed that it is almost completely neutralized after April curing. In the case of a stucco test piece prepared using other high-concentration polymer solutions of different concentrations (Ca concentration 1.5%, 2.0% and 2.5%, gum arabic concentration 1.0%, 2.0% and 3.0%) (not shown) In comparison, there is no significant difference in neutralization due to different concentrations. Generally speaking, the higher the Ca concentration, the faster the neutralization. Differences in gum arabic concentration are observed to have little effect on neutralization. However, when the Ca concentration is 1.5% and the gum arabic concentration is 1.0%, the progress of neutralization is observed to be slow.

  On the other hand, according to FIG. 7, it can be seen that ordinary plaster is not completely neutralized after June curing. In addition, the progress of neutralization after the March curing of normal plaster is observed to be slower (less likely to neutralize) than the neutralization until the February curing.

  The dimension measurement (shrinkage) test was performed by taking a reference dimension of 100 mm and measuring this change in length. The test results are shown in FIG. According to FIG. 8, the amount of shrinkage of ordinary plaster is about 0.2 mm, whereas the amount of shrinkage is 0.95 mm at the highest when the gum arabic concentration is 1.0%. However, when the gum arabic concentration is 2.0% and 3.0%, the amount of shrinkage is as follows for ordinary plaster. In terms of shrinkage, the shrinkage is 1% or less even when the gum arabic concentration is 1.0%, and there is no problem in practical use.

  FIG. 9 shows the results of the weight measurement test. According to FIG. 9, the weight reduction rate of ordinary plaster is about 9.5%, whereas the weight reduction rate is about 9.5% in the case of a stucco test piece prepared using gum arabic concentrations of 1.0%, 2.0% and 3.0%. It is 9.5-13%, exceeding the weight reduction rate of ordinary plaster.

  First, by a method similar to the method for preparing the high Ca polymer solution described in Example 1, a high concentration high Ca polymer solution (gum arabic concentration (Po) is 4.0%, Ca concentration (Ca) is 3.0). %). The high Ca polymer solution having the required Ca concentration or polymer concentration was prepared by the method described in Example 1, the Po4.0% -Ca3.0% high Ca polymer solution, and the 10% acetic acid aqueous solution. It was prepared by mixing an acidic aqueous solution in which oyster shell powder was dissolved in a 10% aqueous acetic acid solution or an acidic aqueous solution in which gum arabic was dissolved in a 10% aqueous acetic acid solution. In addition, the said high concentration high Ca polymer solution can use the thing made from Chuka Kayaku Co., Ltd.

  Stucco test specimens were prepared using high Ca polymer solutions having respective concentrations of Po1.0 to 4.0% -Ca 1.0 to 3.0% prepared as described above, and strength tests and water permeability tests were performed. In the strength test, the shape of the test piece, the production method, and the strength test method were the same as those in Example 1. For the water permeability test, a water permeable plate of length x width x thickness (220 x 250 x 40 mm) was prepared, and a VU socket (made of PVC) of nominal diameter x dimension L (125 x 135 mm) was embedded in this center part 5 mm. It was carried out by filling 500 ml of water (tap water) and measuring the time until the water disappeared (water permeability time). The method for producing the water permeable plate is the same as the method for producing the strength test piece. The mass ratio of quicklime, fine aggregate and high Ca polymer solution was 1: 3: 1.1. The water-lime ratio (W / CaO) was 1.1.

  The bending test results are shown in Tables 2 and 3. In Tables 2 and 3, the Po / Ca column indicates the Po concentration (%), the horizontal column indicates the Ca concentration (%), and each data indicates the bending stress (MPa). Table 2 shows the case where the curing period is January, and Table 3 shows the case where the curing period is March. Curing was performed by air curing. In Tables 2 and 3, when comparing the bending stress level in the column of 0.0%, it can be seen that the bending stress level increases almost in proportion to Ca%. It can be seen that the degree of bending stress is about twice as large as that of. These bending stresses are about 1.5 to 3 times larger than the bending stresses shown in FIG.

  On the other hand, the bending stress degree of Po1.0-4.0% -Ca1.0-3.0% is 1.5-2.0 (MPa), except for Po4.0%, regardless of Po concentration and Ca concentration, Regardless of the curing period, it is almost constant. It can be seen that the bending stress degree of Po 4.0% is generally smaller than the bending stress degree of Po 1.0 to 3.0% −Ca 1.0 to 3.0%, and the bending stress degree varies greatly. The bending stress degree of Po1.0-4.0% -Ca1.0-3.0% shown in Tables 2 and 3 is about 5-10 times larger than the bending stress degree shown in FIG.

  Table 4 shows the results of the water permeability test. The curing period was 28 days. Curing was performed by air curing. The column of concentration / test number indicates Po% -Ca% of the high Ca polymer solution used in this test, and the horizontal column indicates the number of the test piece. Each data shows a water transmission time (hour). The average value is an average value of each test piece.

  According to Table 4, the water permeability time of Po4.0% test piece is prominently larger than the water permeability time of Po0.0 ~ 3.0% test piece. It is presumed that the structure or properties of this material are clearly different from those of other Po-concentration specimens. In addition, in the case of a Po4.0% test piece, the variation in water permeability time is large, and it is estimated that further examination is required to produce a stable quality product.

  The test piece with each concentration of Po1.0-3.0% -Ca1.0-3.0% has a water permeability time of 1-2 hours, and the test piece with each concentration of Po2.0-3.0% -Ca2.0-3.0% The water permeability is about 2 hours. Also, when paying attention to the water permeability of the Ca2.0% -Po1.0% specimen, it is estimated that the water permeability is relatively long and the presence of Ca2.0% ions is effective in improving waterproofness. The This improvement in waterproofness of the Ca2.0% test piece is also observed in the Ca2.0% -Po2.0% and Ca2.0% -Po3.0% test pieces. The water permeability of the Ca1.0% -Po2.0% test piece is about 0.5 hours, which is shorter than the other test pieces. It is presumed that there was some problem with the test piece or test conditions.

  Table 5 shows the standard deviation value of the water permeation time in the case of the test piece in which the Ca concentration is fixed and the Po concentration is changed to 1.0 to 3.0%. Table 6 shows the standard deviation value of the water permeation time in the case of the test piece in which the Po concentration is fixed and the Ca concentration is changed to 1.0 to 3.0%. According to Table 5, it can be seen that the standard deviation value of the test piece of Ca 2.0% -Po 1.0 to 3.0% is extremely small, and it is possible to produce a plaster product having excellent waterproof property and stable waterproof quality. Moreover, it turns out that the waterproof quality of the test piece of Ca3.0% -Po1.0-3.0% is also stable. In the case of the test piece of Ca 1.0% -Po 1.0 to 3.0%, it is understood that the waterproof quality is slightly lacking in stability. On the other hand, according to Table 6, in the case of a test piece with a fixed Po concentration, any test piece with a Po concentration of 1.0 to 3.0% (Ca 1.0 to 3.0%) has almost the same standard deviation value. I understand that.

  According to Example 2 described above, a high Ca polymer solution having a Ca concentration of 2.0% is presumed to be capable of producing a stucco wall having excellent strength and waterproofness and stable quality. For this reason, a stucco wall using a high Ca polymer solution in which the Ca concentration was fixed to 2.0% and the Po concentration was adjusted to 0.0 to 3.0% was prepared, and a proof stress test (shear fracture test) was performed. The plaster material was produced by the same method as the test piece for the strength test in Example 2. In this example, a Ca2.0% -Po0.0% plaster material was also prepared and used as a plaster material for intermediate coating. The mass ratio of quicklime, fine aggregate and high Ca polymer solution was 1: 3: 1.1, and the water-lime ratio (W / CaO) was 1.1.

  As for the plaster wall, mortar plaster using high Ca polymer solution of Ca2.0% -Po1.0-3.0% is prepared, and this is primed to Ki Komai (width 30 × thickness 9 × interval 30mm), then A mortar stucco using a Ca2.0% -Po0.0% high-Ca acidic aqueous solution was applied on the inside. No overcoating was performed. The thickness of the undercoat was 8 mm, and the thickness of the intermediate coat was 12 mm. The plaster wall was 1230 x 400 mm. As shown in FIG. 10, the proof stress test was performed so that one end was fixed and the other end was freely supported, a load was applied to the other end, and a shearing force was applied to the plaster wall. The proof stress test was conducted after 30 days after the undercoating of the plaster wall. For comparison, a mortar plaster wall was also prepared by applying mortar stucco using a Ca 2.0% -Po 0.0% high Ca acidic aqueous solution in the same manner as undercoating (8mm) and intermediate coating (12mm). .

  The test results are shown in FIG. In FIG. 11, the horizontal axis represents the Po concentration of the high Ca polymer solution, and the vertical axis represents the yield strength (maximum breaking load). In addition, when direct coating is applied immediately after undercoating (○ mark), after 7 days of application, when undercoating is applied after curing for 7 days (□ mark), and after 14 days of application The proof stress is shown when the intermediate coat is applied after 14 days of curing the undercoat (△ mark). Curing was performed by air curing. According to FIG. 11, it can be seen that the strength of the plaster wall is almost the same regardless of whether the intermediate coating is from direct coating to 14 days after coating. In addition, the yield strength curve has a peak shape at a peak of Po 2.0%, and the strength of the plastered wall using the Ca 2.0% -Po 2.0% high Ca polymer solution is the highest (3kN) Is shown. However, it has a strength of 60% of the strength (5kN) of the plaster wall consisting of 0.00.0% Po (not including Po) and intermediate coating. The strength of plaster walls using high Ca polymer solution of Ca2.0% -Po1.0% and Ca2.0% -Po3.0% is almost the same. Moreover, the proof stress of the plaster wall is substantially the same in any of direct coating, 7 days after coating, or 14 days after coating.

  In the proof stress test, this stucco wall fracture shows the form that the plaster wall peels off from the wooden Komai when applied directly, and after 7 days it shows the shearing form of the plaster wall itself, after 14 days In the case of application, a form in which the undercoat layer and the intermediate coat layer peeled off was shown. Therefore, the intermediate coating should be performed within 14 days after undercoating. As a fracture form, a plaster wall which has been applied after 7 days is preferable.

1 Ki Komai panel 3 Plaster 5 Middle coat 7 Top coat

Claims (7)

A high Ca polymer solution in which quick lime and / or slaked lime and a polymer material are dissolved in an acidic aqueous solution ,
A high Ca polymer solution in which the polymer material is gum arabic . The high Ca polymer solution according to claim 1, wherein the acidic aqueous solution is an acetic acid aqueous solution. The high Ca polymer solution according to claim 1 or 2 , wherein the quicklime and / or slaked lime is obtained by baking oyster shells at 900 to 1200 ° C.   The polymer material is gum arabic powder, the acidic aqueous solution is an acetic acid aqueous solution, and quick lime and / or slaked lime is dissolved in an acetic acid aqueous solution at a weight percentage concentration of 1.0 to 3.0%, and the gum arabic powder is 0.5 to 3.5%. The high Ca polymer solution according to claim 1. It is a plaster material which has quick lime and / or slaked lime, and a fine aggregate as a main component, Comprising: This plaster material and the high Ca polymer solution as described in any one of Claims 1-4 . A method for producing plaster with excellent waterproofness and strength,
The manufacturing method of the stucco which knead | mixes the stucco material which has quick lime and / or slaked lime, and a fine aggregate as a main component, and the high Ca polymer solution as described in any one of Claims 1-4 . A high Ca polymer solution in which Ca and a polymer material are dissolved in a high concentration in an acidic aqueous solution obtained by simultaneously adding and stirring a quick lime and / or slaked lime powder and a polymer material powder to the acidic aqueous solution. Dilute and mix this high-concentration high-Ca polymer solution with an acidic aqueous solution in which a predetermined amount of quick lime and / or slaked lime powder is dissolved, or this high-concentration high-Ca polymer solution and a predetermined amount of high-calcium solution. A method for producing a high Ca polymer solution, comprising mixing an acidic aqueous solution in which a powder of a molecular material is dissolved to produce a high Ca polymer solution in which the Ca and / or polymer concentration is adjusted.