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Preparation of aqueous dispersions of organopolysiloxanes

A polysiloxane, dispersion technology, applied in other chemical processes, coatings, chemical instruments and methods, etc., can solve problems such as damage to emulsion stability, toxicity, and unsatisfactory ecology

Inactive Publication Date: 2008-06-18
WACKER CHEM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, an elastomeric silicone film insoluble in toluene was not obtained
[0014] There are a number of applications for aqueous dispersions where especially catalysts containing metal catalysts as well as solvents are undesirable because of their toxicity, ecology or other unsatisfactory properties, such as compromising the stability of emulsions on storage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0162] In an Ultra-Turrax T50 type emulsification unit (obtained from Kanke & Kunkel / IKA), 5 g of isotridecyl decathoxylate in 85% in the commercially available under the trademark of Lutensol TO 109 (available from BASF) and 8 g of Ionized water was mixed to prepare an emulsifier mixture, which was then blended with metered addition of 100 g of a freshly prepared homogeneous silicone polymer / silane mixture consisting of 99.65 g as silicone (1) containing 1100 The composition consists of ppm by weight of OH-terminated polydimethylsiloxane diol with 0.39 g of N-morpholinomethyltriethoxysilane (molar mass 263.4) as silane (2). Subsequent partial dilution with a total of 90.1 g of completely deionized water gave a creamy white emulsion with an average particle size of 309 nm. The emulsion had a solids content of 50.7% and a pH of 6.0. The emulsion is homogeneously stable even after 6 months of storage at room temperature.

[0163] When 0.5 g of this emulsion was poured into 8 g...

Embodiment 2-4

[0166] Other emulsions were prepared similarly to Example 1, but using the amounts reported in Table 1 below.

[0167] Table 1

[0168] Example

Silicone

(1)

Silane

(2)

Solid content

(%)

pH

Granularity

(nm)

24 hours / 25℃ drying

Post film evaluation

E2

99.56

0.44

50.5

7

478

very elastic, transparent

E3

99.40

0.60

49.9

7

481

flexible, transparent

E4

99.22

0.79

50.5

6.5

---

elastic, translucent

[0169] The recorded solids content, pH and particle size were determined prior to addition of the silica dispersion.

[0170] The solids content is determined using a Mettler Toledo HR 73 at 150° C. to constant weight.

[0171] Particle size was determined using a Coulter N4 plus.

[0172] The elasticity of films prepared from emulsions (without addition of silica dispersion) decrease...

comparative test 2

[0198] According to Example E3, after mixing the components siloxane (1) and silane (2), that is, the mixture of α,ω-dihydroxypolydimethylsiloxane and morpholinomethyltriethoxy Viscosity increases after silane.

[0199] For comparison, morpholinomethyltriethoxysilane was replaced in C2a-C2f (analogously to comparative experiments C1a-C1f) by the components reported in Table 3 below, and the increase in viscosity was measured again.

[0200] The results are summarized in Table 3 below.

[0201] Although the viscosity increased rapidly with components (1) and (2) according to the invention and doubled after 2 hours, it was no longer possible to measure the viscosity after only 5 hours, but because the elastomer had formed, So the viscosity in the comparative tests C2a-C2f only rises very gradually, even after 7 days crosslinked elastomer particles are still forming.

[0202] table 3

[0203] Compared

[0204] Siloxane (1) = polydimethylsiloxane diol containing 1100...

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Abstract

A method for preparing an organopolysiloxane, by: (a) making an organopolysiloxane (1) comprising a condensable group and having the general formula (I) and a silane (2) of the general formula (II) or Its hydrolyzate is reacted in the presence of water (3) and emulsifier (4), wherein R is a monovalent hydrocarbon group with 1-18 carbon atoms, R1 is a hydrogen atom or an alkyl group with 1-8 carbon atoms, Preferably a hydrogen atom, x is an integer of 10-1100, preferably 20-700, more preferably 30-500, wherein R2 is a hydrogen atom or a monovalent alkyl group with 1-4 carbon atoms, preferably a hydrogen atom, R3 is each The group has an alkyl group with 1-8 carbon atoms, Y is a group with the formula -NHR4, -NR42 or NR5, wherein R4 is a monovalent group with 1-18 carbon atoms optionally containing nitrogen atoms and / or oxygen atoms Hydrocarbon group, R5 is a divalent hydrocarbon group with 3-12 carbon atoms optionally containing nitrogen atom and / or oxygen atom, (b) in the process of reaction (a) or after reaction (a), preferably in reaction ( a) followed by addition of an aqueous dispersion (5) of silica, if appropriate mixed with a silane (2) of formula (II), (c) during or after reaction (a), preferably An adhesion promoter (6) is optionally added after reaction (a), and (d) is optionally added during reaction (a) or after reaction (a), preferably after reaction (a), which does not participate in the reaction The other material (7) of (a), provided that a metal-free catalyst is used and that the organopolysiloxane (1) and silane (2) are used in such amounts that after removal of the water (3) the organopolysiloxane Oxane forms an elastomeric film that is insoluble in toluene.

Description

technical field [0001] The present invention relates to a process for the preparation of aqueous organopolysiloxane dispersions without the use of metal-containing catalysts. The invention also relates to aqueous dispersions of organopolysiloxanes which, after removal of water, give elastomers, and to their use as sealing or coating materials. The invention also relates to elastomeric articles, especially films, seals, coatings and overcoats, prepared from aqueous dispersions of organopolysiloxanes. Background technique [0002] Crosslinked silicone emulsions are known. (Heavy) metal-containing or metal-free catalysts are required for crosslinking silicones and for use as crosslinking agents. In some cases, polymerization inhibitors are also used to control reactivity and storage stability to prevent any unwanted premature gelation. In order to be used as a sealing material for building structures, the cured product must also have a low modulus of elasticity. [0003] Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/04C08G77/08C08L83/04C08J5/18C09K3/10C09D183/04
CPCC08J7/02C08J2383/08C08J5/18C08L83/04C09D183/04C08K5/544C08J3/03C08L83/00C08G77/32
Inventor O·施奈德U·谢姆
Owner WACKER CHEM GMBH
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