DD298651A5 - PROCESS FOR PREPARING STORAGE STABILES OF WEIGHTED DIORGANOPOLYSILOXANE EMULSIONS - Google Patents

Abstract

The preparation of storage-stable aqueous diorganopolysiloxane emulsions with storage times of 6 months is made possible without the use of special homogenizers by stabilization with nonionic emulsifiers of the structure RO & C3H6O! X & C2H4O! YH, where R is C6-C9, preferably C8, x2-50, y1-50 and y * is {Diorganopolysiloxanemulsion. nonionic emulsifier; Alkanol-propylene oxide-ethylene oxide adduct; Lagerstabilitaet; Stabilization; Storage time; homogenizer}

Description

2. The method according to claim 1, characterized in that R is an alkyl radical C ₈ .

Field of application of the invention

The invention relates to a process for the preparation of storage-stable aqueous Diorganopolysiloxanemulsionen for the predominant (use as a release emulsion.

Characteristic of the known state of the art

Aqueous diorganopolysiloxane emulsions for use as a release emulsion are known. These release emulsions are prepared in stock and must also be usable after a storage time of several months without loss of quality. The main problem in the preparation of such emulsions is that the diorganopolysiloxanes are difficult to emulsify, the emulsions tend to phase separate, and often have insufficient long-term stability. Nonylphenyloxethylate stabilized silicone emulsions are described in DD-PS 133196 and 133197. For siloxane emulsions for the treatment of keratinous fiber materials (DE-OS 2725714) Oxethylaie of alkylphenols, polyglycol esters and ethoxylated alkylamines can be used as emulsifiers. Sodium alkylaryl polyethylene glycol sulfonate and partial sodium salts of phosphated alkyl polyglycol ethers are described in DE-OS 2641699 for the preparation of solids-containing diorganopolysiloxane emulsions.

All the emulsifiers listed have in common that the Diorganopolysiloxanemulsionen thus produced do not have sufficient storage stability. This has hitherto only been achieved by additional homogenization in the high-pressure homogenizer. However, this procedure requires additional equipment.

Object of the invention

The aim of the invention is to make an additional expenditure on equipment, in particular additional stabilization by use of special homogenizers, for the purpose of yielding storage-stable diorganopolysiloxane emulsions.

Explanation of the essence of the invention

The invention has for its object to stabilize aqueous Diorganopolysiloxanemulsionen in the mass concentration range of 33 to 68% by addition of a nonionic emulsifier in a concentration of 0.3 to 8% based on mass diorganopolysiloxane so that storage times up to 6 months are possible. According to the invention, a nonionic emulsifier is a compound of the structure

RO- (C ₃ H ₆ O) _x -IC ₂ H ₄ O 1 -H

used, where

R = alkyl radical C ₆ -C ₉ , preferably C ₈ χ = 2-50 y = 1-50

y = 0.3-1.8

The emulsifier is added to the diorganopolysiloxane based on the amount of diorganopolysiloxane in a concentration of 0.3-8%. While stirring, the desired amount of water is added.

With these emulsifiers Olorganopolysiloxanemulsionen can be produced even with relatively low mechanical energy, which significantly exceed the stability of the comparative emulsions. After a storage time of β months, the stability test by means of a centrifuge test for emulsions for whose preparation the emulsifiers were used yields virtually no phase separation, while the comparison emulsions disintegrate after only a few days or weeks. The improvement of the storage stability by the use of the emulsifier having the structure of the attached structure is not disadvantageous since this effect did not occur in the use of other nonionic emulsifiers previously used.

The surprising suitability of the nonionic emulsifiers used for the preparation of storage-stable aqueous Diorganopolysiloxanemulsionen prove the results in Tubelle. 1

Table 1 Property comparison of NOP 6/7 _EO with EH _PO 8 _EO 8

characteristic value NOP6 / 7 _EO EHpo8eo8 surface tension 1g / linmN / m 31.2 32.1 TrübungspunktTbo 61.3 61.7 TNV100 0.85 0.80 Schaumvermogen: 1 g / l to V 75 71 Detergency: rest pigment 66% 65% residual fat 0% 0% Raw wool wash residual fat 1.05% 0.9% resistance silicone emulsion insufficient very well

At practically the same values for physicochemical characteristics and performance testing, the emulsifiers used surprisingly differ from the comparison point by their excellent suitability for the preparation of storage-stable aqueous Diorganopolysiloxanemulsionen.

embodiments The following examples are not intended to limit the scope of the invention claim, but instead of

the variety of tested nonionic emulsifiers only a selection.

Aqueous diorganopolysiloxane emulsion having a content of 33-68% diorganopolysiloxane was investigated for which

comparisons of those with the composition 60 parts diorganopolysiloxane, 37 parts water and 1.6 to 5%

Emulsifier, based on the mass diorganopolysiloxane used. After preparing the aqueous Diorganopolysiloxane emulsions by means of laboratory stirrer were the stability of Diorganopolysiloxanemulsionen after

Tested 24 hours, 1.3 and 6 months. The test method used was the zone centrifugation test. The Diorganopolysiloxanemulsion was charged at the time of testing in each case for 10 minutes with 3000min " ¹ , at best while allowing traces of water to settle.

The stability values listed in Table 2 clearly show the surprising superiority of the used

nonionic emulsifiers for the emulsification of diorganopoiysiloxanes, while the comparatively with

Alkylphenylpolyglycolethern Diorganopolysiloxanemulsions produced are not storage stable. Table 2 Stability of aqueous diorganopolysiloxane emulsions depending on the emulsifier

Emulsifier starting component PO EO Emulsifier concentration% 1) Stability (ml H ₂ O deposition) immediately 24 h 1 0 2.5 track 3 6 months 2-ethylhexanol nonylphenol 5 0 5 6.5 1.7 1.7 0 0.6 0 0 0.7 0 0 0 1.1 0 track 1 2-ethylhexanol 2-ethylhexanol nonylphenol 2-ethylhexanol 5 20 (l SO 5 20 6.5 30 3.3 3.3 3.3 3.3 0 0 0.2 0 0 0 1.7 track Track Spur 2.2 lane

2-ethylhexanol 30 30 5 0 0 0 0 0 2-ethylhexanol 25 12.5 5 0 0 0 0 0 2-ethylhexanol 5 5 5 0 0 0 0 0 2-ethylhexanol 14 16 5 0 0 0 0 track nonylphenol 0 6.5 5 0.3 0.3 0.5 0.6 0.8

1) based on mass diorganopolysiloxane

Claims (1)

1. A process for the preparation of storage-stable aqueous Diorganopolysiloxanemulsionen in the mass concentration range of 33 to 68% with 0.3 to 8% nonionic emulsifier based on mass diorganopolysiloxane gekonnzeichnet that as a nonionic emulsifier, a compound of the structure RO- [C ₃ H ₆ O] _x - [C ₂ H ₄ Oly-H is used, wherein R = alkyl radical C ₆ -C ₉ , and
χ = 2-50
y = 1-50 I = 0.3-1.8