DE1005269B - Process for the production of non-hardenable, non-stringy, storage-stable pastes with a fat-like consistency based on silicone oils and fillers - Google Patents

Description

Process for making non-curable, non-stringing, storage-stable Pastes with a fatty consistency based on silicone oils and fillers It is known to produce silicone pastels or fats by using silicone oils, especially liquid organopolysiloxanes, with a suitable, finely cured filler mixes and the substances, e.g. B. on a roller mill, intimately with each other, .r impoverished. By varying the ratio of silicone oil to filler or by selection High or low viscosity oils can practically be pastes of 1 eliel) iger consistency obtain.

However, such pastes still have various disadvantages. at often recently heated to 1500 or higher there is a risk that they become runny or sweat oil. Such pastes also change hot at room temperature long standing their consistency and become slightly thinner pastes, which with have become liquid after prolonged heating, can also be removed after adding more It is very difficult to get the filler back to its original consistency 1).

The invention is a method for producing a Silicone paste. which both in storage and in the heat do not change their consistency changes.

Apart from a silicone oil, it contains little or no silicone oil soluble organic matter of oil, fat or waxy character and one finely divided filler, e.g. B. an inorganic pigment such as silica. That Mixing ratio of this silicone oil with the insoluble or sparingly soluble organic Substance can vary within wide limits.

A mixture of the two oils is processed to produce the paste in a known manner with the filler to form a homogeneous paste. As mutually intertwined Two different silicone oils, 2.13. Combinations of methyl polysiloxanes and phenylmethyl polysiloxanes of methyl hydrogen polysiloxanes and stearylmethylpolysiloxanes or of methylpolysiloxanes with phenylpolysiloxanes be used.

Instead of silicones with -Si-O-Si structural units, Oils with a -Si-C-Si structure or oily substances that contain two or more different ones Having kinds of 5 structural units in their molecules can be used as far as the two components are only insoluble or only slightly soluble in one another. Such pastes show all known advantages of the betterell stahility besides the already mentioned advantages favorable properties of the previous silicone pastes with regard to the chemical and electrical behavior, the hydrophobing effect, the heat resistance etc. It is also possible that a silicone oil by an organic substance of oily, greasy or waxy character, which can be found in the silicone oil used does not solve or only a little, such. B. natural or synthetic Mineral oil, liquid, solid, semi-solid paraffins. Waxes, fats, phthalic acid esters, silicic acid esters and Polysilicic acid esters, or all water-soluble compounds, such as glycerine, Glycols, polyglycols, to replace. In all those cases where a silicone paste is not extremely high requirements in terms of chemical and electrical behavior, the water-repellent effect and the heat resistance can be made the paste contain such a substance instead of the one silicone oil. Such Pastes also do not change their consistency when stored or in the heat. By Appropriate selection of the second component can thus be the properties of the Adapt silicone paste to the respective requirements and thus also a reduction in price of the paste.

The pastes according to the invention can be used except on their own known It is also used, for example, for the production of medicinal ointments, if necessary after incorporation of remedies, it can be used with advantage, as the silicones Physiologically completely indifferent and therefore better tolerated in many cases are known as the ointment bases.

The pastes can be produced, for. B. be done so that the silicone oil with the other in it not or only a little component and by stirring or Distribute an emulsion. Then you can add the filler and that whole, e.g. n. on a roller mill to process the paste. However, Maii can do the Also incorporate filler without first emulsifying the two components.

A silicone oil is used together with a silicone oil to make the pastes If solid organic material is processed, it is heated above its melting point and then emulsifies it with the silicone oil. Processing can also take place at higher Temperature take place.

Example 1 3 kg of methylpolysiloxane with a viscosity of 800 cSt at 250 with 0.8 kg of phenylmeillpolysiloxane with a viscosity of 150 cSt stirred to an emulsion and then in a mill with 0.5 kg of finely divided, good dried silica processed until a completely homogeneous paste was created is.

Even after heating to 2000 for 80 hours, this paste still does not show any Change in their consistency.

Example 2 1.5 kg of silicone oil with a viscosity of 875 cSt ati 250 are emulsified with 500 g of mineral oil with a viscosity of 240 cSt. In a Mill, the emulsion is homogenized with 225 g of the finest silica to form a paste. The paste shows no change after heating to 1500 for 65 hours.

Example 3 600 g of methylpolysiloxane oil with a viscosity of 800 cSt at 250 are processed with 200 g of Vaseline and 80 g of the finest silica and homogenized.

A paste is obtained that can also be used after prolonged standing at room temperature shows no change.

The paste can be used as a skin ointment.

Example 4 a) 120 g of phenylmethylpolysiloxane oil of 500 cSt, the every second Si atom has a phenyl radical, and 640 g of dimethylpolysiloxane of 350 cSt are mixed together to form an emulsion and with 240 g of titanium dioxide mixed until the whole thing has become homogeneous. b) In addition, 240 g of titanium dioxide are used and 760 grams of 350 cSt dimethylpolysiloxane oil by rubbing the two components together a paste is produced which differs from that produced according to a) by slightly less Viscosity is different.

Both pastes are heated to 200 ° for several hours. After 1 hour is paste a) unchanged while; b) has become significantly thinner.

After 3 hours t or 6 hours a) remained unchanged during b) has passed into a very thin liquid state after just 3 hours. at there is no noticeable further standing at either normal or elevated temperature Changes in viscosity more on.

Example 5 330 grams of 500 cSt phenylinethylsiloxane oil applied to each The second Si atom contains a phenyl radical, with 430 g of methyl hydrogen polysiloxane of 20 cSt and mixed with 240 g of fine powdered aluminum oxide too a homogeneous paste, which changes in viscosity even after prolonged heating not changed.

Example 6 200 g of a siloxane oil of 150 cSt, which, besides methyl groups, is on average on every third silicon atom contains a phenyl group, with 600 g of a dimethylpolysiloxane oil of 1000 cSt stirred into an emulsion and then mixed with 200 g of finely powdered silica. The whole thing is mixed well together until a thick, homogeneous mass is formed, which does not change its consistency even after prolonged heating.

Example 7 2 kg of dimethyl silicone oil which has a viscosity of 1000 cSt owns. 150 g linseed oil and 350 g Äfineralöl are mixed with a high speed stirrer emulsified with each other. To stabilize this emulsion are among other things Stirring 40 g of finely divided titanium dioxide were added.

I3isp.iel 8 500 g of a silicone oil, produced by hydrolysis of monomethyldichlorosilane, 2000 g of dimethyl silicone oil and 300 g of a phenylmethylpolysiloxane, which by hydrolysis of 1 part of dimethyldichlorosilane and 2 parts of phenylmethyldichlorosilane was obtained, with 400 g of the finest silica, as described in Example 1, processed into a paste. PATENT CLAIMS: 1. Method of manufacture no hardenable, non-stringy, storage-stable pastes with a greasy consistency based on silicone oils and fillers, characterized. that a filler in a silicone oil in the presence of significant amounts of one in the latter not or only sparingly soluble organic matter of oil. fatty or waxy character is dispersed.

Claims (1)

2. The method according to claim 1, characterized in that as organic Substance in the silicone oil serving as a dispersant little or no substance soluble silicone oil is used. 3. The method according to claim 1 and 2, characterized in that the organic substance in an amount of 10 to 50 percent by weight, based on the paste, is applied. 4. The method according to claim 1 to 3, characterized in that Finely powdered silicic acid is used as filler. References considered: U.S. Patent No. 2,507422, 2,575,687; French Patent Document No. 971 283; Hunyar, »Chemistry of Silicones«, Berlin, 1952, p. 172.