Compositions: coating or plastic – Coating or plastic compositions – Coating repellent
Reexamination Certificate
2000-04-04
2002-05-28
Barr, Michael (Department: 1762)
Compositions: coating or plastic
Coating or plastic compositions
Coating repellent
C106S014110, C106S014440, C106S612000, C106S613000, C106S634000, C106S287100, C106S286600
Reexamination Certificate
active
06395075
ABSTRACT:
The invention relates to a method of producing a waterproofing product, to such product, and to a method for impregnation of a surface of solid building materials against liquids as well as against chemical and biological corrosion.
BACKGROUND OF THE INVENTION
There are on the market numerous products or agents which are intended for painting or coating of surfaces of solid building materials, such as walls, ceilings and/or floors of parts of buildings, water tanks, swimming pools or the like, in order to waterproof these surfaces and/or to impregnate them against chemical and biological corrosion. These known products generally are rubber-based or plastic-based products (synthetic resin or epoxy resin) or special paints. However, the known products available on the market have shown themselves to be frequently inadequate in their effect and in their durability, particularly when several requirements are to be met simultaneously, as is the case for example when surfaces are to be protected against liquids (particularly water) and also simultaneously against chemical and/or biological corrosion, such as occurs for example in water reservoirs, swimming pools and the like which are built in the open.
The GB-A-927 059 discloses a waterproof composition containing the following components in percent by weight: Curd Soap 10% to 18%, Water 28% to 40%, Slaked Lime 44% to 50%, and Sodium Silicate 2% to 4%. Such a waterproofing composition can be manufactured in the following way:
shredding or flaking Curd Soap and stirring it into a quantity of Water heated in a container;
adding further Water whilst the mixture is still under heat, until the Soap has been completely dissolved;
boiling the dissolved soap and water mixture;
adding slaked lime gradually thereto, slowly mixing the materials, removing them from the heat;
and adding Sodium Silicate.
In this way, a thick paste is formed which can be marketed without further modification. This paste may be—for use—mixed up with water and various dilutions, so that, obviously, this will generally result only in any diluted paste. Such a waterproofing composition may be applied to walls, stone-work or plaster, or may be added to cement, plaster and similar liquid mixture appropriate for rendering walls or the like prior to making up. Where such a composition is for use as a coating material on already prepared walls or other surfaces, the strength is relatively week, whereas, when the composition is added to liquid mixtures for new building purposes, the strength may be much higher (cf. page 1, lines 76 to 78 in this specification).
According to the Abstract of JP-A-60 016 898 (NISSHIN KOGIO KK), Jan. 28, 1985 (DATABASE WPI, Section Ch, Week 8510, Derwent Publications Ltd., London/GB), a composition is prepared of water glass (35-50 wt. %), NaOH or KOH (0.5-3 wt. %) water (10-30 wt. %), cement (10-30 wt. %), Ca oxide (0.5-3 wt. %), Al powder (0.5-5 wt. %), filler (Ca carbonate, Mg carbonate, Mg hydroxide, silica stone powder . . . of 10-30 wt. %) and glycerin (2-6 wt. %). Such a composition is useful for the preparation of foam material for heat-insulating material, filtering material, sound absorber etc. A so-formed waterproof foam body has high strength and high durability at ordinary temperatures. However, such a composition for forming a foam body is not able to produce or propose, respectively, a product to be applied relatively simply and quickly to a surface of a building material which is to be waterproofed or protected in a very economical and durable way, as it is proposed with the teaching of the present application, particularly in order to close pores of surface walls or the like.
The object of the invention, therefore, is to provide a method of producing a waterproofing product, such waterproofing product, and a method of treating surfaces of building materials in such a way that, on the one hand, a treatment product or coating product is made available which is relatively simple and economical to produce as well as having many uses and being reliable and durable in its effect and, on the other hand, such a product can be applied relatively simply and quickly to a surface of a building material which is to be protected.
SUMMARY OF THE INVENTION
A first aspect of the present invention concerns a method of producing or preparing a treatment product or coating product in order to make a surface of corresponding building materials water-repellent or waterproof and thereby to impregnate or protect this surface against liquids as well as against chemical and biological corrosion. According to the invention such a product is generally produced by the following steps:
a) preparing a first aqueous solution (base solution) by dissolving calcium oxide (CaO) in a quantity of water with the aid of a dissolving agent which is admixed with this quantity of water in order to increase the dissolution or the dissolving effect of the calcium oxide in water;
b) preparing a second aqueous solution which contains water and sodium silicate;
c) mixing together the first aqueous solution with the second aqueous solution so that an aqueous solution product (treatment product or coating product) is formed which contains silicon, calcium, and sodium ions and which forms on the corresponding building material surface a film or coating having glassy characteristics.
By means of this method of production according to the invention, a product is made available which is ready for use in the form of an aqueous solution and which can be applied in a manner which is extremely simple to handle and relatively quickly to a building material surface which is to be protected. However, in the dried state the product produces a solid and durable, insoluble surface film due to the double silicate [sodium calcium silicate] which is formed because of the silicon, calcium and sodium ions present in the prepared aqueous solvent product.
THE PREFERRED EMBODIMENTS
In the method of producing the product particular importance is given to the knowledge that calcium oxide dissolves in water only in extremely small quantities. In order to be able to dissolve a sufficient quantity of calcium oxide in the given quantity of water, first of all according to the invention the first aqueous solution (base solution) referred to above under a) is prepared, in which a sufficiently large quantity of calcium oxide can be dissolved in the predetermined quantity of water because this quantity of water has a suitable dissolving agent mixed with it in order thereby to improve or to increase the dissolution of the calcium oxide. In this connection it should be mentioned that only approximately 1 g of calcium oxide can be dissolved in one liter of water; however, by the admixture of the dissolving agent a multiple of this quantity of calcium oxide can be dissolved in the same quantity of water, so that this admixture of the dissolving agent makes it possible to dissolve a correspondingly larger quantity of calcium oxide in the same quantity of water and thereby to control the ratio of calcium oxide and sodium silicate in the prepared aqueous solution product.
Basically any dissolving agent which is suitable for dissolving an increased quantity of calcium oxide in the given quantity of water can be used in the quantity of water of the first aqueous solution-. According to the present invention it is particularly preferred if sugar in the form of saccharose (C
12
H
22
O
11
) is dissolved as dissolving agent in the first aqueous solution in order to dissolve an increased quantity of calcium oxide therein. Thus ordinary sugar can be used to a certain extent as a type of catalyst in order markedly to increase the dissolving power of the calcium oxide in water. Thus for example approximately 32 g of calcium oxide can dissolve in a liter of water in which 400 g of sugar/saccharose are dissolved, which means that 100 g of sugar/saccharose contribute to approximately 8 g of calcium oxide being dissolved in a corresponding quantity of water.
In many cases, however, it may also be favourable in the me
Barr Michael
Reising Ethington, Barnes, Kisselle, Learman & McCulloch, P.C.
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