Compositions: coating or plastic – Coating or plastic compositions – Carbohydrate or derivative containing
Patent
1995-09-21
1997-04-15
Brunsman, David
Compositions: coating or plastic
Coating or plastic compositions
Carbohydrate or derivative containing
10616251, 1061628, 10616281, C09D10102, C09D10126, C09D10128, C09D10302
Patent
active
056205090
DESCRIPTION:
BRIEF SUMMARY
The object of the invention is a coating mixture which contains cellulose fiber and binder in a mixture with water. The invention also relates to a method for the preparation and application of the coating mixture.
A great variety of sprayable wall coatings are known in the building industry. The use of cement as a binder is common to these solutions. The cement makes the finished coating resemble plaster, which i.a. for reasons of appearance considerably limits the use of the coating. Furthermore, the surface is hard and inelastic, and crumbles easily, and it does not stick to all building materials.
Coatings are also known, for example from the US-publication U.S. Pat. No. 4,994,509, which as a filler contain cellulose fibers together with a second, for example colouring filler component, such as quartz powder. However, the use of additional fillers, especially in large amounts, makes the aqueous coating mixture hard and difficult to handle, and it cannot be applied by spraying without problems.
The aim of the invention is to provide a sprayable mass containing natural fibers and binder, which may be used as a porous interior wall and ceiling coating in place of e.g. a sprayed plaster coating, conventional wall paper or the like. The object is thus to obtain a spreadable coating for such applications where also a sound absorbing coating is desired. In order to achieve this object, the filler component of the coating according to the invention consists of finely divided cellulose fibers, without mineral and other additional fillers. The coating composition according to the invention is thus characterized in that it contains 3 to 15% by weight, and the combined dry matter content of cellulose filler and binder of the mixture is higher than approximately 12% by weight.
By using, in the coating mixture, cellulose fibers, especially cotton fibers, as the only filler, a porous and easily finishable coating is obtained, which in addition has excellent sound dampening properties.
In the coating mixture according to the invention, the amount of binder calculated from the cellulose filler is from 3 to 15% by weight, especially from 3 to 11% by weight. The dry matter content of the filler and the binder in the mixture is advantageously higher than 15, such as 15 to 25, especially in the range of 15 to 20% by weight, as calculated from the whole mixture.
As the cellulose fiber, for example, finely divided cotton cellulose fibers may be used, which are commercially available in almost 100% pure form and bleached. Other suitable cellulose fiber products comprise wood cellulose fiber, flax cellulose fiber, as well as other possible cellulose fiber products of vegetable origin, as well as fiber products of regenerated cellulose, such as viscose.
As a binder both water soluble cellulose based binders, such as cellulose ethers, for example methylcellulose, hydroxypropyl- and hydroxyethylcellulose, and especially carboxymethylcellulose, CMC are suitable. Said cellulose derivatives are commercially available. A second binder class is formed by cold water soluble starches and starch derivatives.
The amount of binder to be used in the mixture according to the invention depends on the viscosity of the binder and on the desired adhesion, but the range mentioned above is generally suitable. CMC is commercially available, a suitable grade being for example Finnfix 300, manufacturer Mets a-Serla, wherein the CMC is in the form of the Na-salt of CMC.
The type of foaming agent to be used in the mixture is not critical, but per se known surface active agents may be used in the mixture, such as anion active, cation active and non-ionic surface active agents, i.e. tensides. Anion active tensides are i.a. alkylbenzene sulfonates, alkane sulfonates, fatty alcohol sulfates and fatty alcohol ether sulfates, advantageously long chain alkylsulfate salts, such as sodium laurylsulfate, and soaps. Non-ionic tensides are i.a. ethoxylated fatty alcohols, fatty amines, fatty acids and fatty acid esters, and aminoxides. The amount of foaming agent
REFERENCES:
patent: 4994509 (1991-02-01), Laurent
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