DE1283732B - Artificial marble casting compound - Google Patents

Description

Artificial marble casting masses They are artificial marble casting masses made from sulfur-free and also sulphurous high alumina cement, sand or quartz sand, colored natural stones, Color and water known. Those made from the well-known artificial marble casting compounds Components, such as steps, etc., but have the disadvantage that the surface changes quickly under climatic influences and loses its initial shine.

It is also known that an addition of calcium chloride to cementitious Masses accelerate the setting and, in addition, the strength and spatial stability of manufactured items increased. Also the use of corundum and / or silicon carbide in concrete masses is known, for. B. from German patent specification 710 429.

The invention relates to an artificial marble casting compound made from sulfur-free Alumina cement, sand or quartz sand, paint and water by a content 5 to 20 percent by volume of a pore densifying agent made of sodium sulfate, calcium chloride, fine grain calcium carbonate and fine grain silicon dioxide by volume of high alumina cement.

During the processing of the artificial marble casting compound according to the invention an artificial marble with excellent properties.

The new artificial marble casting compounds are not quick-setting compounds, as in the known methods by adding more than 2% calcium chloride can be achieved, because the pore compacting agent, consisting of four components, the setting is not accelerated, but a significant reduction in the hardening time achieved. That the well-known, the setting accelerating effect of calcium chloride is not the same effect as the acceleration achieved according to the invention Hardening is also evident from the fact that, according to the invention, preferably only 0.1 up to 0.2% calcium chloride should be used and all of the pore compacting agent is only 5 to 20 percent by volume, based on the volume of the high-alumina cement, while according to the prior art more than 2% calcium chloride to accelerate should be used for setting.

The artificial marble casting compound according to the invention has the further advantage that you do not have to cool so much when processing them during the setting time as with the well-known artificial marble casting compounds. Required with the compositions of the invention the shortening of the curing time achieved only 12 to 24 hours after Bringing the mass into the mold up to the stripping from the same opposite up to to 8 days with the known masses.

When introducing into the mold, neither must be pressed or tamped Stripping of the workpiece is neither troweled, peeled off, sanded or polished will. The components produced from the artificial marble casting compound according to the invention have a significantly increased strength compared to the known artificial marble casting compound, an increased durability of the gloss and the advantage that no dimensional change the component occurs.

The constituents of the pore densifying agent are preferably present in the following proportions (based on the total weight of the pore densifying agent on an anhydrous basis): 0.1 to 0.2, in particular 0.1% calcium chloride, 1 to 2.3, in particular 10/0 sodium sulfate , 22 to 25, especially 23 to 240 /, calcium carbonate, the remainder being silicon dioxide.

If you also consider the strength, especially the abrasion resistance If you want to increase the number of components, you replace the sand or quartz sand in whole or in part by silicon carbide and / or corundum. The grain size of the silicon carbide should be preferable correspond to DIN test sieves number 5 to 60, the grain size of the corundum corresponds to DIN test sieves 20 to 50.

This results in components that are compared with the following the values of the regulation DIN 1100 for hard concrete coverings of groups A and C are shown will.

According to the regulation of DIN 1100, the groups: Group A contain hard concrete materials with predominantly artificially produced components such as silicon carbide, corundum, also slag of a special kind. Group C hard concrete materials with predominantly natural or artificially grained natural rock and slag by itself or with additions of at least 5 percent by weight of substances from group A.

The type and level of stress according to DIN 1100 is divided into: Art I Mainly grind Pedestrian Reinforced.-., Pedestrian traffic pedestrian mass traffic traffic Move more easily move using Heavy goods Art 1I Rolling, grinding friction, shock and impact Pedestrian dropping off, rumbling from traffic, sliding, heavy goods easy moderate Goods goods' The prescribed values according to DIN 1100 are: Ax I and 1I For the For wear and tear. Strengths at most bending Pressure- cm $ / 50 ema festi _ fix- noity Group A 1 group C kg / cm2 kg / cm2 Art I L .... 3.5 5.0 group M ... 2.5 5.0 A 50 500 S .... 2.0 5.0 Art II L .... 3.5; 7.0 group M ... 2.5 1 7.0 C 65 650 S .... 2.0 7.0 In contrast, the samples from the artificial marble casting compound according to the invention, according to the test report mentioned: For wear and tear. For strengths Sample no. Wear resistance flexural tension compression strength strength cm2 / 50 cm2 kg / cm2 kg / cm2 1 0.9. 127 948 928 2 0.8 131 1012 988 3 0.9. 129.1000 - 1012 Medium .... 0.9 129 981 The new artificial marble casting compounds thus show a considerable improvement in the mechanical values as well as in the production method, by means of which faster hardening is achieved, whereby artificial marble components are obtained that neither need to be reground nor repolished, even if they contain corundum or silicon carbide.

The color content of the artificial marble casting compound should preferably be at most 5010, in particular at most 40/0, based on the weight of the high-alumina cement.

If vein marble is to be produced, the part of the casting compound which is to form the veins, from the pore compacting agent and the cement in the Volume ratio 0.5 to 1.5 exist, with the cement up to 5 percent by weight contains pure color by its weight.

Mixed for the production of the artificial marble casting compound according to the invention first dry sand (or quartz sand), cement and pore compacting agent. Then you add the color and mix thoroughly again. If different If paints are to be used, one divides the mixture of sand, cement and pore compactor in an appropriate manner and mixes separate parts of this mixture with the respective color. To the color mixes add water in an amount that corresponds to at most half the volume of the cement. First you give the Add half of the total amount of water, mix the batch thoroughly and then add the Rest of the water too, preferably in small proportions.

The artificial marble casting compound according to the invention is preferably cast in shapes with a smooth surface, for example made of metal or plexiglass. To Introducing the casting compound is the mold to avoid or remove air pores knocked off. The setting takes place in the air, preferably with the exclusion of sunlight, if possible with moderate cooling, for example in a cool room. To The components are removed from the molds for 12 to 24 hours. A regrinding or polishing the components is not required.

The components are left for a few hours. Then you can Wash off with the lukewarm solution of a surfactant. After drying the components are warmed up slightly and rubbed with thin, warm linseed oil away. This is rubbed off again after a few hours with a woolen cloth.

If you want to make flame marble, bring the viscous ones different colored parts of the potting compound initially in a container without mixing together in any distribution and fills the mold with the mass produced in this way in the middle lengthways. Then the mass is left by tapping the mold diverge from the bottom to the sides of the mold.

If you want to make cloud marble, you pour a thin, Put multicolored potting compound into the mold and knock or shake the mold from below.

Some recipes of the artificial marble casting compound according to the invention are given below. Room parts 2. Sulfur-free Alumina cement 1 Silicon carbide (DIN sieve no.16) ..... 0.6 Silicon carbide (DIN sieve no. 60) ..... 0.2 Silicon carbide (DIN sieve No. 30) ..... 0.05 corundum (DIN sieve no.46) ..... 0.15 Quartz sand ........... 1.1 Compaction agent .... 0.1 White color ......... 5 weight from the percent weight of Cement

Claims (5)

Claims: 1. Artificial marble casting compound made from sulfur-free high-alumina cement, Sand or quartz sand, paint and water, marked by a content of 5 to 20 volume percent of a pore densifying agent made from sodium sulfate, calcium chloride, fine grain calcium carbonate and fine grain silicon dioxide by volume of high alumina cement. 2. Artificial marble casting compound according to claim 1, characterized in that that the sand or quartz sand wholly or partly by silicon carbide with a grain size according to DIN test sieves No. 5 to 60 and / or corundum with a grain size accordingly DIN test sieves number 20 to 50 has been replaced. 3. artificial marble casting compound according to claim 1 or 2, characterized by a dye content of at most 5%, based on on the weight of the high alumina cement. 4. Artificial marble casting compound according to one of claims 1 to 3, characterized by a content, based on the weight of the pore densifying agent on an anhydrous basis, of 0.1 to 0.2% calcium chloride, 1 to 2.3% sodium sulfate, 22 up to 25 % calcium carbonate, the remainder silicon dioxide. 5. Artificial marble casting compound according to one of claims 1 to 4 for the production of vein marble, characterized in that the part of the casting compound from which the veins are to be produced consists of the pore compacting agent and high-alumina cement in a volume ratio of 0.5 to 1.5, the Cement containing up to 501, its weight in color of the greatest purity. Documents considered: German Patent No. 710 429; P rabst, Handbuch der Betonsteinindustrie, 1951, pp. 618, 621, 660, 661.